0001 Atomic Number = 1 0002 Atomic Symbol = H 0003 Mass Number = 1 0004 Relative Atomic Mass = 1.0078250321(4) 0005 Isotopic Composition = 99.9885(70) 0006 Standard Atomic Weight = 1.00794(7) 0007 Notes = g,m,r,c,w 0008 0009 Atomic Number = 1 0010 Atomic Symbol = D 0011 Mass Number = 2 0012 Relative Atomic Mass = 2.0141017780(4) 0013 Isotopic Composition = 0.0115(70) 0014 Standard Atomic Weight = 1.00794(7) 0015 Notes = g,m,r,c,w 0016 0017 Atomic Number = 1 0018 Atomic Symbol = T 0019 Mass Number = 3 0020 Relative Atomic Mass = 3.0160492675(11) 0021 Isotopic Composition = 0022 Standard Atomic Weight = 1.00794(7) 0023 Notes = g,m,r,c,w 0024 0025 Atomic Number = 2 0026 Atomic Symbol = He 0027 Mass Number = 3 0028 Relative Atomic Mass = 3.0160293097(9) 0029 Isotopic Composition = 0.000137(3) 0030 Standard Atomic Weight = 4.002602(2) 0031 Notes = g,r,a 0032 0033 Atomic Number = 2 0034 Atomic Symbol = He 0035 Mass Number = 4 0036 Relative Atomic Mass = 4.0026032497(10) 0037 Isotopic Composition = 99.999863(3) 0038 Standard Atomic Weight = 4.002602(2) 0039 Notes = g,r,a 0040 0041 Atomic Number = 3 0042 Atomic Symbol = Li 0043 Mass Number = 6 0044 Relative Atomic Mass = 6.0151223(5) 0045 Isotopic Composition = 7.59(4) 0046 Standard Atomic Weight = 6.941(2) 0047 Notes = g,m,r,b,d 0048 0049 Atomic Number = 3 0050 Atomic Symbol = Li 0051 Mass Number = 7 0052 Relative Atomic Mass = 7.0160040(5) 0053 Isotopic Composition = 92.41(4) 0054 Standard Atomic Weight = 6.941(2) 0055 Notes = g,m,r,b,d 0056 0057 Atomic Number = 4 0058 Atomic Symbol = Be 0059 Mass Number = 9 0060 Relative Atomic Mass = 9.0121821(4) 0061 Isotopic Composition = 100 0062 Standard Atomic Weight = 9.012182(3) 0063 Notes = 0064 0065 Atomic Number = 5 0066 Atomic Symbol = B 0067 Mass Number = 10 0068 Relative Atomic Mass = 10.0129370(4) 0069 Isotopic Composition = 19.9(7) 0070 Standard Atomic Weight = 10.811(7) 0071 Notes = g,m,r 0072 0073 Atomic Number = 5 0074 Atomic Symbol = B 0075 Mass Number = 11 0076 Relative Atomic Mass = 11.0093055(5) 0077 Isotopic Composition = 80.1(7) 0078 Standard Atomic Weight = 10.811(7) 0079 Notes = g,m,r 0080 0081 Atomic Number = 6 0082 Atomic Symbol = C 0083 Mass Number = 12 0084 Relative Atomic Mass = 12.0000000(0) 0085 Isotopic Composition = 98.93(8) 0086 Standard Atomic Weight = 12.0107(8) 0087 Notes = g,r 0088 0089 Atomic Number = 6 0090 Atomic Symbol = C 0091 Mass Number = 13 0092 Relative Atomic Mass = 13.0033548378(10) 0093 Isotopic Composition = 1.07(8) 0094 Standard Atomic Weight = 12.0107(8) 0095 Notes = g,r 0096 0097 Atomic Number = 6 0098 Atomic Symbol = C 0099 Mass Number = 14 0100 Relative Atomic Mass = 14.003241988(4) 0101 Isotopic Composition = 0102 Standard Atomic Weight = 12.0107(8) 0103 Notes = g,r 0104 0105 Atomic Number = 7 0106 Atomic Symbol = N 0107 Mass Number = 14 0108 Relative Atomic Mass = 14.0030740052(9) 0109 Isotopic Composition = 99.632(7) 0110 Standard Atomic Weight = 14.0067(2) 0111 Notes = g,r,e 0112 0113 Atomic Number = 7 0114 Atomic Symbol = N 0115 Mass Number = 15 0116 Relative Atomic Mass = 15.0001088984(9) 0117 Isotopic Composition = 0.368(7) 0118 Standard Atomic Weight = 14.0067(2) 0119 Notes = g,r,e 0120 0121 Atomic Number = 8 0122 Atomic Symbol = O 0123 Mass Number = 16 0124 Relative Atomic Mass = 15.9949146221(15) 0125 Isotopic Composition = 99.757(16) 0126 Standard Atomic Weight = 15.9994(3) 0127 Notes = g,r 0128 0129 Atomic Number = 8 0130 Atomic Symbol = O 0131 Mass Number = 17 0132 Relative Atomic Mass = 16.99913150(22) 0133 Isotopic Composition = 0.038(1) 0134 Standard Atomic Weight = 15.9994(3) 0135 Notes = g,r 0136 0137 Atomic Number = 8 0138 Atomic Symbol = O 0139 Mass Number = 18 0140 Relative Atomic Mass = 17.9991604(9) 0141 Isotopic Composition = 0.205(14) 0142 Standard Atomic Weight = 15.9994(3) 0143 Notes = g,r 0144 0145 Atomic Number = 9 0146 Atomic Symbol = F 0147 Mass Number = 19 0148 Relative Atomic Mass = 18.99840320(7) 0149 Isotopic Composition = 100 0150 Standard Atomic Weight = 18.9984032(5) 0151 Notes = 0152 0153 Atomic Number = 10 0154 Atomic Symbol = Ne 0155 Mass Number = 20 0156 Relative Atomic Mass = 19.9924401759(20) 0157 Isotopic Composition = 90.48(3) 0158 Standard Atomic Weight = 20.1797(6) 0159 Notes = g,m,r,a 0160 0161 Atomic Number = 10 0162 Atomic Symbol = Ne 0163 Mass Number = 21 0164 Relative Atomic Mass = 20.99384674(4) 0165 Isotopic Composition = 0.27(1) 0166 Standard Atomic Weight = 20.1797(6) 0167 Notes = g,m,r,a 0168 0169 Atomic Number = 10 0170 Atomic Symbol = Ne 0171 Mass Number = 22 0172 Relative Atomic Mass = 21.99138551(23) 0173 Isotopic Composition = 9.25(3) 0174 Standard Atomic Weight = 20.1797(6) 0175 Notes = g,m,r,a 0176 0177 Atomic Number = 11 0178 Atomic Symbol = Na 0179 Mass Number = 23 0180 Relative Atomic Mass = 22.98976967(23) 0181 Isotopic Composition = 100 0182 Standard Atomic Weight = 22.989770(2) 0183 Notes = 0184 0185 Atomic Number = 12 0186 Atomic Symbol = Mg 0187 Mass Number = 24 0188 Relative Atomic Mass = 23.98504190(20) 0189 Isotopic Composition = 78.99(4) 0190 Standard Atomic Weight = 24.3050(6) 0191 Notes = 0192 0193 Atomic Number = 12 0194 Atomic Symbol = Mg 0195 Mass Number = 25 0196 Relative Atomic Mass = 24.98583702(20) 0197 Isotopic Composition = 10.00(1) 0198 Standard Atomic Weight = 24.3050(6) 0199 Notes = 0200 0201 Atomic Number = 12 0202 Atomic Symbol = Mg 0203 Mass Number = 26 0204 Relative Atomic Mass = 25.98259304(21) 0205 Isotopic Composition = 11.01(3) 0206 Standard Atomic Weight = 24.3050(6) 0207 Notes = 0208 0209 Atomic Number = 13 0210 Atomic Symbol = Al 0211 Mass Number = 27 0212 Relative Atomic Mass = 26.98153844(14) 0213 Isotopic Composition = 100 0214 Standard Atomic Weight = 26.981538(2) 0215 Notes = 0216 0217 Atomic Number = 14 0218 Atomic Symbol = Si 0219 Mass Number = 28 0220 Relative Atomic Mass = 27.9769265327(20) 0221 Isotopic Composition = 92.2297(7) 0222 Standard Atomic Weight = 28.0855(3) 0223 Notes = r 0224 0225 Atomic Number = 14 0226 Atomic Symbol = Si 0227 Mass Number = 29 0228 Relative Atomic Mass = 28.97649472(3) 0229 Isotopic Composition = 4.6832(5) 0230 Standard Atomic Weight = 28.0855(3) 0231 Notes = r 0232 0233 Atomic Number = 14 0234 Atomic Symbol = Si 0235 Mass Number = 30 0236 Relative Atomic Mass = 29.97377022(5) 0237 Isotopic Composition = 3.0872(5) 0238 Standard Atomic Weight = 28.0855(3) 0239 Notes = r 0240 0241 Atomic Number = 15 0242 Atomic Symbol = P 0243 Mass Number = 31 0244 Relative Atomic Mass = 30.97376151(20) 0245 Isotopic Composition = 100 0246 Standard Atomic Weight = 30.973761(2) 0247 Notes = 0248 0249 Atomic Number = 16 0250 Atomic Symbol = S 0251 Mass Number = 32 0252 Relative Atomic Mass = 31.97207069(12) 0253 Isotopic Composition = 94.93(31) 0254 Standard Atomic Weight = 32.065(5) 0255 Notes = g,r 0256 0257 Atomic Number = 16 0258 Atomic Symbol = S 0259 Mass Number = 33 0260 Relative Atomic Mass = 32.97145850(12) 0261 Isotopic Composition = 0.76(2) 0262 Standard Atomic Weight = 32.065(5) 0263 Notes = g,r 0264 0265 Atomic Number = 16 0266 Atomic Symbol = S 0267 Mass Number = 34 0268 Relative Atomic Mass = 33.96786683(11) 0269 Isotopic Composition = 4.29(28) 0270 Standard Atomic Weight = 32.065(5) 0271 Notes = g,r 0272 0273 Atomic Number = 16 0274 Atomic Symbol = S 0275 Mass Number = 36 0276 Relative Atomic Mass = 35.96708088(25) 0277 Isotopic Composition = 0.02(1) 0278 Standard Atomic Weight = 32.065(5) 0279 Notes = g,r 0280 0281 Atomic Number = 17 0282 Atomic Symbol = Cl 0283 Mass Number = 35 0284 Relative Atomic Mass = 34.96885271(4) 0285 Isotopic Composition = 75.78(4) 0286 Standard Atomic Weight = 35.453(2) 0287 Notes = m 0288 0289 Atomic Number = 17 0290 Atomic Symbol = Cl 0291 Mass Number = 37 0292 Relative Atomic Mass = 36.96590260(5) 0293 Isotopic Composition = 24.22(4) 0294 Standard Atomic Weight = 35.453(2) 0295 Notes = m 0296 0297 Atomic Number = 18 0298 Atomic Symbol = Ar 0299 Mass Number = 36 0300 Relative Atomic Mass = 35.96754628(27) 0301 Isotopic Composition = 0.3365(30) 0302 Standard Atomic Weight = 39.948(1) 0303 Notes = g,r,a 0304 0305 Atomic Number = 18 0306 Atomic Symbol = Ar 0307 Mass Number = 38 0308 Relative Atomic Mass = 37.9627322(5) 0309 Isotopic Composition = 0.0632(5) 0310 Standard Atomic Weight = 39.948(1) 0311 Notes = g,r,a 0312 0313 Atomic Number = 18 0314 Atomic Symbol = Ar 0315 Mass Number = 40 0316 Relative Atomic Mass = 39.962383123(3) 0317 Isotopic Composition = 99.6003(30) 0318 Standard Atomic Weight = 39.948(1) 0319 Notes = g,r,a 0320 0321 Atomic Number = 19 0322 Atomic Symbol = K 0323 Mass Number = 39 0324 Relative Atomic Mass = 38.9637069(3) 0325 Isotopic Composition = 93.2581(44) 0326 Standard Atomic Weight = 39.0983(1) 0327 Notes = 0328 0329 Atomic Number = 19 0330 Atomic Symbol = K 0331 Mass Number = 40 0332 Relative Atomic Mass = 39.96399867(29) 0333 Isotopic Composition = 0.0117(1) 0334 Standard Atomic Weight = 39.0983(1) 0335 Notes = 0336 0337 Atomic Number = 19 0338 Atomic Symbol = K 0339 Mass Number = 41 0340 Relative Atomic Mass = 40.96182597(28) 0341 Isotopic Composition = 6.7302(44) 0342 Standard Atomic Weight = 39.0983(1) 0343 Notes = 0344 0345 Atomic Number = 20 0346 Atomic Symbol = Ca 0347 Mass Number = 40 0348 Relative Atomic Mass = 39.9625912(3) 0349 Isotopic Composition = 96.941(156) 0350 Standard Atomic Weight = 40.078(4) 0351 Notes = g,r,f 0352 0353 Atomic Number = 20 0354 Atomic Symbol = Ca 0355 Mass Number = 42 0356 Relative Atomic Mass = 41.9586183(4) 0357 Isotopic Composition = 0.647(23) 0358 Standard Atomic Weight = 40.078(4) 0359 Notes = g,r,f 0360 0361 Atomic Number = 20 0362 Atomic Symbol = Ca 0363 Mass Number = 43 0364 Relative Atomic Mass = 42.9587668(5) 0365 Isotopic Composition = 0.135(10) 0366 Standard Atomic Weight = 40.078(4) 0367 Notes = g,r,f 0368 0369 Atomic Number = 20 0370 Atomic Symbol = Ca 0371 Mass Number = 44 0372 Relative Atomic Mass = 43.9554811(9) 0373 Isotopic Composition = 2.086(110) 0374 Standard Atomic Weight = 40.078(4) 0375 Notes = g,r,f 0376 0377 Atomic Number = 20 0378 Atomic Symbol = Ca 0379 Mass Number = 46 0380 Relative Atomic Mass = 45.9536928(25) 0381 Isotopic Composition = 0.004(3) 0382 Standard Atomic Weight = 40.078(4) 0383 Notes = g,r,f 0384 0385 Atomic Number = 20 0386 Atomic Symbol = Ca 0387 Mass Number = 48 0388 Relative Atomic Mass = 47.952534(4) 0389 Isotopic Composition = 0.187(21) 0390 Standard Atomic Weight = 40.078(4) 0391 Notes = g,r,f 0392 0393 Atomic Number = 21 0394 Atomic Symbol = Sc 0395 Mass Number = 45 0396 Relative Atomic Mass = 44.9559102(12) 0397 Isotopic Composition = 100 0398 Standard Atomic Weight = 44.955910(8) 0399 Notes = 0400 0401 Atomic Number = 22 0402 Atomic Symbol = Ti 0403 Mass Number = 46 0404 Relative Atomic Mass = 45.9526295(12) 0405 Isotopic Composition = 8.25(3) 0406 Standard Atomic Weight = 47.867(1) 0407 Notes = 0408 0409 Atomic Number = 22 0410 Atomic Symbol = Ti 0411 Mass Number = 47 0412 Relative Atomic Mass = 46.9517638(10) 0413 Isotopic Composition = 7.44(2) 0414 Standard Atomic Weight = 47.867(1) 0415 Notes = 0416 0417 Atomic Number = 22 0418 Atomic Symbol = Ti 0419 Mass Number = 48 0420 Relative Atomic Mass = 47.9479471(10) 0421 Isotopic Composition = 73.72(3) 0422 Standard Atomic Weight = 47.867(1) 0423 Notes = 0424 0425 Atomic Number = 22 0426 Atomic Symbol = Ti 0427 Mass Number = 49 0428 Relative Atomic Mass = 48.9478708(10) 0429 Isotopic Composition = 5.41(2) 0430 Standard Atomic Weight = 47.867(1) 0431 Notes = 0432 0433 Atomic Number = 22 0434 Atomic Symbol = Ti 0435 Mass Number = 50 0436 Relative Atomic Mass = 49.9447921(11) 0437 Isotopic Composition = 5.18(2) 0438 Standard Atomic Weight = 47.867(1) 0439 Notes = 0440 0441 Atomic Number = 23 0442 Atomic Symbol = V 0443 Mass Number = 50 0444 Relative Atomic Mass = 49.9471628(14) 0445 Isotopic Composition = 0.250(4) 0446 Standard Atomic Weight = 50.9415(1) 0447 Notes = 0448 0449 Atomic Number = 23 0450 Atomic Symbol = V 0451 Mass Number = 51 0452 Relative Atomic Mass = 50.9439637(14) 0453 Isotopic Composition = 99.750(4) 0454 Standard Atomic Weight = 50.9415(1) 0455 Notes = 0456 0457 Atomic Number = 24 0458 Atomic Symbol = Cr 0459 Mass Number = 50 0460 Relative Atomic Mass = 49.9460496(14) 0461 Isotopic Composition = 4.345(13) 0462 Standard Atomic Weight = 51.9961(6) 0463 Notes = 0464 0465 Atomic Number = 24 0466 Atomic Symbol = Cr 0467 Mass Number = 52 0468 Relative Atomic Mass = 51.9405119(15) 0469 Isotopic Composition = 83.789(18) 0470 Standard Atomic Weight = 51.9961(6) 0471 Notes = 0472 0473 Atomic Number = 24 0474 Atomic Symbol = Cr 0475 Mass Number = 53 0476 Relative Atomic Mass = 52.9406538(15) 0477 Isotopic Composition = 9.501(17) 0478 Standard Atomic Weight = 51.9961(6) 0479 Notes = 0480 0481 Atomic Number = 24 0482 Atomic Symbol = Cr 0483 Mass Number = 54 0484 Relative Atomic Mass = 53.9388849(15) 0485 Isotopic Composition = 2.365(7) 0486 Standard Atomic Weight = 51.9961(6) 0487 Notes = 0488 0489 Atomic Number = 25 0490 Atomic Symbol = Mn 0491 Mass Number = 55 0492 Relative Atomic Mass = 54.9380496(14) 0493 Isotopic Composition = 100 0494 Standard Atomic Weight = 54.938049(9) 0495 Notes = 0496 0497 Atomic Number = 26 0498 Atomic Symbol = Fe 0499 Mass Number = 54 0500 Relative Atomic Mass = 53.9396148(14) 0501 Isotopic Composition = 5.845(35) 0502 Standard Atomic Weight = 55.845(2) 0503 Notes = 0504 0505 Atomic Number = 26 0506 Atomic Symbol = Fe 0507 Mass Number = 56 0508 Relative Atomic Mass = 55.9349421(15) 0509 Isotopic Composition = 91.754(36) 0510 Standard Atomic Weight = 55.845(2) 0511 Notes = 0512 0513 Atomic Number = 26 0514 Atomic Symbol = Fe 0515 Mass Number = 57 0516 Relative Atomic Mass = 56.9353987(15) 0517 Isotopic Composition = 2.119(10) 0518 Standard Atomic Weight = 55.845(2) 0519 Notes = 0520 0521 Atomic Number = 26 0522 Atomic Symbol = Fe 0523 Mass Number = 58 0524 Relative Atomic Mass = 57.9332805(15) 0525 Isotopic Composition = 0.282(4) 0526 Standard Atomic Weight = 55.845(2) 0527 Notes = 0528 0529 Atomic Number = 27 0530 Atomic Symbol = Co 0531 Mass Number = 59 0532 Relative Atomic Mass = 58.9332002(15) 0533 Isotopic Composition = 100 0534 Standard Atomic Weight = 58.933200(9) 0535 Notes = 0536 0537 Atomic Number = 28 0538 Atomic Symbol = Ni 0539 Mass Number = 58 0540 Relative Atomic Mass = 57.9353479(15) 0541 Isotopic Composition = 68.0769(89) 0542 Standard Atomic Weight = 58.6934(2) 0543 Notes = 0544 0545 Atomic Number = 28 0546 Atomic Symbol = Ni 0547 Mass Number = 60 0548 Relative Atomic Mass = 59.9307906(15) 0549 Isotopic Composition = 26.2231(77) 0550 Standard Atomic Weight = 58.6934(2) 0551 Notes = 0552 0553 Atomic Number = 28 0554 Atomic Symbol = Ni 0555 Mass Number = 61 0556 Relative Atomic Mass = 60.9310604(15) 0557 Isotopic Composition = 1.1399(6) 0558 Standard Atomic Weight = 58.6934(2) 0559 Notes = 0560 0561 Atomic Number = 28 0562 Atomic Symbol = Ni 0563 Mass Number = 62 0564 Relative Atomic Mass = 61.9283488(15) 0565 Isotopic Composition = 3.6345(17) 0566 Standard Atomic Weight = 58.6934(2) 0567 Notes = 0568 0569 Atomic Number = 28 0570 Atomic Symbol = Ni 0571 Mass Number = 64 0572 Relative Atomic Mass = 63.9279696(16) 0573 Isotopic Composition = 0.9256(9) 0574 Standard Atomic Weight = 58.6934(2) 0575 Notes = 0576 0577 Atomic Number = 29 0578 Atomic Symbol = Cu 0579 Mass Number = 63 0580 Relative Atomic Mass = 62.9296011(15) 0581 Isotopic Composition = 69.17(3) 0582 Standard Atomic Weight = 63.546(3) 0583 Notes = r 0584 0585 Atomic Number = 29 0586 Atomic Symbol = Cu 0587 Mass Number = 65 0588 Relative Atomic Mass = 64.9277937(19) 0589 Isotopic Composition = 30.83(3) 0590 Standard Atomic Weight = 63.546(3) 0591 Notes = r 0592 0593 Atomic Number = 30 0594 Atomic Symbol = Zn 0595 Mass Number = 64 0596 Relative Atomic Mass = 63.9291466(18) 0597 Isotopic Composition = 48.63(60) 0598 Standard Atomic Weight = 65.409(4) 0599 Notes = 0600 0601 Atomic Number = 30 0602 Atomic Symbol = Zn 0603 Mass Number = 66 0604 Relative Atomic Mass = 65.9260368(16) 0605 Isotopic Composition = 27.90(27) 0606 Standard Atomic Weight = 65.409(4) 0607 Notes = 0608 0609 Atomic Number = 30 0610 Atomic Symbol = Zn 0611 Mass Number = 67 0612 Relative Atomic Mass = 66.9271309(17) 0613 Isotopic Composition = 4.10(13) 0614 Standard Atomic Weight = 65.409(4) 0615 Notes = 0616 0617 Atomic Number = 30 0618 Atomic Symbol = Zn 0619 Mass Number = 68 0620 Relative Atomic Mass = 67.9248476(17) 0621 Isotopic Composition = 18.75(51) 0622 Standard Atomic Weight = 65.409(4) 0623 Notes = 0624 0625 Atomic Number = 30 0626 Atomic Symbol = Zn 0627 Mass Number = 70 0628 Relative Atomic Mass = 69.925325(4) 0629 Isotopic Composition = 0.62(3) 0630 Standard Atomic Weight = 65.409(4) 0631 Notes = 0632 0633 Atomic Number = 31 0634 Atomic Symbol = Ga 0635 Mass Number = 69 0636 Relative Atomic Mass = 68.925581(3) 0637 Isotopic Composition = 60.108(9) 0638 Standard Atomic Weight = 69.723(1) 0639 Notes = m 0640 0641 Atomic Number = 31 0642 Atomic Symbol = Ga 0643 Mass Number = 71 0644 Relative Atomic Mass = 70.9247050(19) 0645 Isotopic Composition = 39.892(9) 0646 Standard Atomic Weight = 69.723(1) 0647 Notes = m 0648 0649 Atomic Number = 32 0650 Atomic Symbol = Ge 0651 Mass Number = 70 0652 Relative Atomic Mass = 69.9242504(19) 0653 Isotopic Composition = 20.84(87) 0654 Standard Atomic Weight = 72.64(1) 0655 Notes = h 0656 0657 Atomic Number = 32 0658 Atomic Symbol = Ge 0659 Mass Number = 72 0660 Relative Atomic Mass = 71.9220762(16) 0661 Isotopic Composition = 27.54(34) 0662 Standard Atomic Weight = 72.64(1) 0663 Notes = h 0664 0665 Atomic Number = 32 0666 Atomic Symbol = Ge 0667 Mass Number = 73 0668 Relative Atomic Mass = 72.9234594(16) 0669 Isotopic Composition = 7.73(5) 0670 Standard Atomic Weight = 72.64(1) 0671 Notes = h 0672 0673 Atomic Number = 32 0674 Atomic Symbol = Ge 0675 Mass Number = 74 0676 Relative Atomic Mass = 73.9211782(16) 0677 Isotopic Composition = 36.28(73) 0678 Standard Atomic Weight = 72.64(1) 0679 Notes = h 0680 0681 Atomic Number = 32 0682 Atomic Symbol = Ge 0683 Mass Number = 76 0684 Relative Atomic Mass = 75.9214027(16) 0685 Isotopic Composition = 7.61(38) 0686 Standard Atomic Weight = 72.64(1) 0687 Notes = h 0688 0689 Atomic Number = 33 0690 Atomic Symbol = As 0691 Mass Number = 75 0692 Relative Atomic Mass = 74.9215964(18) 0693 Isotopic Composition = 100 0694 Standard Atomic Weight = 74.92160(2) 0695 Notes = 0696 0697 Atomic Number = 34 0698 Atomic Symbol = Se 0699 Mass Number = 74 0700 Relative Atomic Mass = 73.9224766(16) 0701 Isotopic Composition = 0.89(4) 0702 Standard Atomic Weight = 78.96(3) 0703 Notes = r 0704 0705 Atomic Number = 34 0706 Atomic Symbol = Se 0707 Mass Number = 76 0708 Relative Atomic Mass = 75.9192141(16) 0709 Isotopic Composition = 9.37(29) 0710 Standard Atomic Weight = 78.96(3) 0711 Notes = r 0712 0713 Atomic Number = 34 0714 Atomic Symbol = Se 0715 Mass Number = 77 0716 Relative Atomic Mass = 76.9199146(16) 0717 Isotopic Composition = 7.63(16) 0718 Standard Atomic Weight = 78.96(3) 0719 Notes = r 0720 0721 Atomic Number = 34 0722 Atomic Symbol = Se 0723 Mass Number = 78 0724 Relative Atomic Mass = 77.9173095(16) 0725 Isotopic Composition = 23.77(28) 0726 Standard Atomic Weight = 78.96(3) 0727 Notes = r 0728 0729 Atomic Number = 34 0730 Atomic Symbol = Se 0731 Mass Number = 80 0732 Relative Atomic Mass = 79.9165218(20) 0733 Isotopic Composition = 49.61(41) 0734 Standard Atomic Weight = 78.96(3) 0735 Notes = r 0736 0737 Atomic Number = 34 0738 Atomic Symbol = Se 0739 Mass Number = 82 0740 Relative Atomic Mass = 81.9167000(22) 0741 Isotopic Composition = 8.73(22) 0742 Standard Atomic Weight = 78.96(3) 0743 Notes = r 0744 0745 Atomic Number = 35 0746 Atomic Symbol = Br 0747 Mass Number = 79 0748 Relative Atomic Mass = 78.9183376(20) 0749 Isotopic Composition = 50.69(7) 0750 Standard Atomic Weight = 79.904(1) 0751 Notes = 0752 0753 Atomic Number = 35 0754 Atomic Symbol = Br 0755 Mass Number = 81 0756 Relative Atomic Mass = 80.916291(3) 0757 Isotopic Composition = 49.31(7) 0758 Standard Atomic Weight = 79.904(1) 0759 Notes = 0760 0761 Atomic Number = 36 0762 Atomic Symbol = Kr 0763 Mass Number = 78 0764 Relative Atomic Mass = 77.920386(7) 0765 Isotopic Composition = 0.35(1) 0766 Standard Atomic Weight = 83.798(2) 0767 Notes = g,m,a 0768 0769 Atomic Number = 36 0770 Atomic Symbol = Kr 0771 Mass Number = 80 0772 Relative Atomic Mass = 79.916378(4) 0773 Isotopic Composition = 2.28(6) 0774 Standard Atomic Weight = 83.798(2) 0775 Notes = g,m,a 0776 0777 Atomic Number = 36 0778 Atomic Symbol = Kr 0779 Mass Number = 82 0780 Relative Atomic Mass = 81.9134846(28) 0781 Isotopic Composition = 11.58(14) 0782 Standard Atomic Weight = 83.798(2) 0783 Notes = g,m,a 0784 0785 Atomic Number = 36 0786 Atomic Symbol = Kr 0787 Mass Number = 83 0788 Relative Atomic Mass = 82.914136(3) 0789 Isotopic Composition = 11.49(6) 0790 Standard Atomic Weight = 83.798(2) 0791 Notes = g,m,a 0792 0793 Atomic Number = 36 0794 Atomic Symbol = Kr 0795 Mass Number = 84 0796 Relative Atomic Mass = 83.911507(3) 0797 Isotopic Composition = 57.00(4) 0798 Standard Atomic Weight = 83.798(2) 0799 Notes = g,m,a 0800 0801 Atomic Number = 36 0802 Atomic Symbol = Kr 0803 Mass Number = 86 0804 Relative Atomic Mass = 85.9106103(12) 0805 Isotopic Composition = 17.30(22) 0806 Standard Atomic Weight = 83.798(2) 0807 Notes = g,m,a 0808 0809 Atomic Number = 37 0810 Atomic Symbol = Rb 0811 Mass Number = 85 0812 Relative Atomic Mass = 84.9117893(25) 0813 Isotopic Composition = 72.17(2) 0814 Standard Atomic Weight = 85.4678(3) 0815 Notes = g 0816 0817 Atomic Number = 37 0818 Atomic Symbol = Rb 0819 Mass Number = 87 0820 Relative Atomic Mass = 86.9091835(27) 0821 Isotopic Composition = 27.83(2) 0822 Standard Atomic Weight = 85.4678(3) 0823 Notes = g 0824 0825 Atomic Number = 38 0826 Atomic Symbol = Sr 0827 Mass Number = 84 0828 Relative Atomic Mass = 83.913425(4) 0829 Isotopic Composition = 0.56(1) 0830 Standard Atomic Weight = 87.62(1) 0831 Notes = g,r,f 0832 0833 Atomic Number = 38 0834 Atomic Symbol = Sr 0835 Mass Number = 86 0836 Relative Atomic Mass = 85.9092624(24) 0837 Isotopic Composition = 9.86(1) 0838 Standard Atomic Weight = 87.62(1) 0839 Notes = g,r,f 0840 0841 Atomic Number = 38 0842 Atomic Symbol = Sr 0843 Mass Number = 87 0844 Relative Atomic Mass = 86.9088793(24) 0845 Isotopic Composition = 7.00(1) 0846 Standard Atomic Weight = 87.62(1) 0847 Notes = g,r,f 0848 0849 Atomic Number = 38 0850 Atomic Symbol = Sr 0851 Mass Number = 88 0852 Relative Atomic Mass = 87.9056143(24) 0853 Isotopic Composition = 82.58(1) 0854 Standard Atomic Weight = 87.62(1) 0855 Notes = g,r,f 0856 0857 Atomic Number = 39 0858 Atomic Symbol = Y 0859 Mass Number = 89 0860 Relative Atomic Mass = 88.9058479(25) 0861 Isotopic Composition = 100 0862 Standard Atomic Weight = 88.90585(2) 0863 Notes = 0864 0865 Atomic Number = 40 0866 Atomic Symbol = Zr 0867 Mass Number = 90 0868 Relative Atomic Mass = 89.9047037(23) 0869 Isotopic Composition = 51.45(40) 0870 Standard Atomic Weight = 91.224(2) 0871 Notes = g 0872 0873 Atomic Number = 40 0874 Atomic Symbol = Zr 0875 Mass Number = 91 0876 Relative Atomic Mass = 90.9056450(23) 0877 Isotopic Composition = 11.22(5) 0878 Standard Atomic Weight = 91.224(2) 0879 Notes = g 0880 0881 Atomic Number = 40 0882 Atomic Symbol = Zr 0883 Mass Number = 92 0884 Relative Atomic Mass = 91.9050401(23) 0885 Isotopic Composition = 17.15(8) 0886 Standard Atomic Weight = 91.224(2) 0887 Notes = g 0888 0889 Atomic Number = 40 0890 Atomic Symbol = Zr 0891 Mass Number = 94 0892 Relative Atomic Mass = 93.9063158(25) 0893 Isotopic Composition = 17.38(28) 0894 Standard Atomic Weight = 91.224(2) 0895 Notes = g 0896 0897 Atomic Number = 40 0898 Atomic Symbol = Zr 0899 Mass Number = 96 0900 Relative Atomic Mass = 95.908276(3) 0901 Isotopic Composition = 2.80(9) 0902 Standard Atomic Weight = 91.224(2) 0903 Notes = g 0904 0905 Atomic Number = 41 0906 Atomic Symbol = Nb 0907 Mass Number = 93 0908 Relative Atomic Mass = 92.9063775(24) 0909 Isotopic Composition = 100 0910 Standard Atomic Weight = 92.90638(2) 0911 Notes = 0912 0913 Atomic Number = 42 0914 Atomic Symbol = Mo 0915 Mass Number = 92 0916 Relative Atomic Mass = 91.906810(4) 0917 Isotopic Composition = 14.84(35) 0918 Standard Atomic Weight = 95.94(2) 0919 Notes = g 0920 0921 Atomic Number = 42 0922 Atomic Symbol = Mo 0923 Mass Number = 94 0924 Relative Atomic Mass = 93.9050876(20) 0925 Isotopic Composition = 9.25(12) 0926 Standard Atomic Weight = 95.94(2) 0927 Notes = g 0928 0929 Atomic Number = 42 0930 Atomic Symbol = Mo 0931 Mass Number = 95 0932 Relative Atomic Mass = 94.9058415(20) 0933 Isotopic Composition = 15.92(13) 0934 Standard Atomic Weight = 95.94(2) 0935 Notes = g 0936 0937 Atomic Number = 42 0938 Atomic Symbol = Mo 0939 Mass Number = 96 0940 Relative Atomic Mass = 95.9046789(20) 0941 Isotopic Composition = 16.68(2) 0942 Standard Atomic Weight = 95.94(2) 0943 Notes = g 0944 0945 Atomic Number = 42 0946 Atomic Symbol = Mo 0947 Mass Number = 97 0948 Relative Atomic Mass = 96.9060210(20) 0949 Isotopic Composition = 9.55(8) 0950 Standard Atomic Weight = 95.94(2) 0951 Notes = g 0952 0953 Atomic Number = 42 0954 Atomic Symbol = Mo 0955 Mass Number = 98 0956 Relative Atomic Mass = 97.9054078(20) 0957 Isotopic Composition = 24.13(31) 0958 Standard Atomic Weight = 95.94(2) 0959 Notes = g 0960 0961 Atomic Number = 42 0962 Atomic Symbol = Mo 0963 Mass Number = 100 0964 Relative Atomic Mass = 99.907477(6) 0965 Isotopic Composition = 9.63(23) 0966 Standard Atomic Weight = 95.94(2) 0967 Notes = g 0968 0969 Atomic Number = 43 0970 Atomic Symbol = Tc 0971 Mass Number = 97 0972 Relative Atomic Mass = 96.906365(5) 0973 Isotopic Composition = 0974 Standard Atomic Weight = [98] 0975 Notes = 0976 0977 Atomic Number = 43 0978 Atomic Symbol = Tc 0979 Mass Number = 98 0980 Relative Atomic Mass = 97.907216(4) 0981 Isotopic Composition = 0982 Standard Atomic Weight = [98] 0983 Notes = 0984 0985 Atomic Number = 43 0986 Atomic Symbol = Tc 0987 Mass Number = 99 0988 Relative Atomic Mass = 98.9062546(21) 0989 Isotopic Composition = 0990 Standard Atomic Weight = [98] 0991 Notes = 0992 0993 Atomic Number = 44 0994 Atomic Symbol = Ru 0995 Mass Number = 96 0996 Relative Atomic Mass = 95.907598(8) 0997 Isotopic Composition = 5.54(14) 0998 Standard Atomic Weight = 101.07(2) 0999 Notes = g 1000 1001 Atomic Number = 44 1002 Atomic Symbol = Ru 1003 Mass Number = 98 1004 Relative Atomic Mass = 97.905287(7) 1005 Isotopic Composition = 1.87(3) 1006 Standard Atomic Weight = 101.07(2) 1007 Notes = g 1008 1009 Atomic Number = 44 1010 Atomic Symbol = Ru 1011 Mass Number = 99 1012 Relative Atomic Mass = 98.9059393(21) 1013 Isotopic Composition = 12.76(14) 1014 Standard Atomic Weight = 101.07(2) 1015 Notes = g 1016 1017 Atomic Number = 44 1018 Atomic Symbol = Ru 1019 Mass Number = 100 1020 Relative Atomic Mass = 99.9042197(22) 1021 Isotopic Composition = 12.60(7) 1022 Standard Atomic Weight = 101.07(2) 1023 Notes = g 1024 1025 Atomic Number = 44 1026 Atomic Symbol = Ru 1027 Mass Number = 101 1028 Relative Atomic Mass = 100.9055822(22) 1029 Isotopic Composition = 17.06(2) 1030 Standard Atomic Weight = 101.07(2) 1031 Notes = g 1032 1033 Atomic Number = 44 1034 Atomic Symbol = Ru 1035 Mass Number = 102 1036 Relative Atomic Mass = 101.9043495(22) 1037 Isotopic Composition = 31.55(14) 1038 Standard Atomic Weight = 101.07(2) 1039 Notes = g 1040 1041 Atomic Number = 44 1042 Atomic Symbol = Ru 1043 Mass Number = 104 1044 Relative Atomic Mass = 103.905430(4) 1045 Isotopic Composition = 18.62(27) 1046 Standard Atomic Weight = 101.07(2) 1047 Notes = g 1048 1049 Atomic Number = 45 1050 Atomic Symbol = Rh 1051 Mass Number = 103 1052 Relative Atomic Mass = 102.905504(3) 1053 Isotopic Composition = 100 1054 Standard Atomic Weight = 102.90550(2) 1055 Notes = 1056 1057 Atomic Number = 46 1058 Atomic Symbol = Pd 1059 Mass Number = 102 1060 Relative Atomic Mass = 101.905608(3) 1061 Isotopic Composition = 1.02(1) 1062 Standard Atomic Weight = 106.42(1) 1063 Notes = g,r 1064 1065 Atomic Number = 46 1066 Atomic Symbol = Pd 1067 Mass Number = 104 1068 Relative Atomic Mass = 103.904035(5) 1069 Isotopic Composition = 11.14(8) 1070 Standard Atomic Weight = 106.42(1) 1071 Notes = g,r 1072 1073 Atomic Number = 46 1074 Atomic Symbol = Pd 1075 Mass Number = 105 1076 Relative Atomic Mass = 104.905084(5) 1077 Isotopic Composition = 22.33(8) 1078 Standard Atomic Weight = 106.42(1) 1079 Notes = g,r 1080 1081 Atomic Number = 46 1082 Atomic Symbol = Pd 1083 Mass Number = 106 1084 Relative Atomic Mass = 105.903483(5) 1085 Isotopic Composition = 27.33(3) 1086 Standard Atomic Weight = 106.42(1) 1087 Notes = g,r 1088 1089 Atomic Number = 46 1090 Atomic Symbol = Pd 1091 Mass Number = 108 1092 Relative Atomic Mass = 107.903894(4) 1093 Isotopic Composition = 26.46(9) 1094 Standard Atomic Weight = 106.42(1) 1095 Notes = g,r 1096 1097 Atomic Number = 46 1098 Atomic Symbol = Pd 1099 Mass Number = 110 1100 Relative Atomic Mass = 109.905152(12) 1101 Isotopic Composition = 11.72(9) 1102 Standard Atomic Weight = 106.42(1) 1103 Notes = g,r 1104 1105 Atomic Number = 47 1106 Atomic Symbol = Ag 1107 Mass Number = 107 1108 Relative Atomic Mass = 106.905093(6) 1109 Isotopic Composition = 51.839(8) 1110 Standard Atomic Weight = 107.8682(2) 1111 Notes = g 1112 1113 Atomic Number = 47 1114 Atomic Symbol = Ag 1115 Mass Number = 109 1116 Relative Atomic Mass = 108.904756(3) 1117 Isotopic Composition = 48.161(8) 1118 Standard Atomic Weight = 107.8682(2) 1119 Notes = g 1120 1121 Atomic Number = 48 1122 Atomic Symbol = Cd 1123 Mass Number = 106 1124 Relative Atomic Mass = 105.906458(6) 1125 Isotopic Composition = 1.25(6) 1126 Standard Atomic Weight = 112.411(8) 1127 Notes = g 1128 1129 Atomic Number = 48 1130 Atomic Symbol = Cd 1131 Mass Number = 108 1132 Relative Atomic Mass = 107.904183(6) 1133 Isotopic Composition = 0.89(3) 1134 Standard Atomic Weight = 112.411(8) 1135 Notes = g 1136 1137 Atomic Number = 48 1138 Atomic Symbol = Cd 1139 Mass Number = 110 1140 Relative Atomic Mass = 109.903006(3) 1141 Isotopic Composition = 12.49(18) 1142 Standard Atomic Weight = 112.411(8) 1143 Notes = g 1144 1145 Atomic Number = 48 1146 Atomic Symbol = Cd 1147 Mass Number = 111 1148 Relative Atomic Mass = 110.904182(3) 1149 Isotopic Composition = 12.80(12) 1150 Standard Atomic Weight = 112.411(8) 1151 Notes = g 1152 1153 Atomic Number = 48 1154 Atomic Symbol = Cd 1155 Mass Number = 112 1156 Relative Atomic Mass = 111.9027572(30) 1157 Isotopic Composition = 24.13(21) 1158 Standard Atomic Weight = 112.411(8) 1159 Notes = g 1160 1161 Atomic Number = 48 1162 Atomic Symbol = Cd 1163 Mass Number = 113 1164 Relative Atomic Mass = 112.9044009(30) 1165 Isotopic Composition = 12.22(12) 1166 Standard Atomic Weight = 112.411(8) 1167 Notes = g 1168 1169 Atomic Number = 48 1170 Atomic Symbol = Cd 1171 Mass Number = 114 1172 Relative Atomic Mass = 113.9033581(30) 1173 Isotopic Composition = 28.73(42) 1174 Standard Atomic Weight = 112.411(8) 1175 Notes = g 1176 1177 Atomic Number = 48 1178 Atomic Symbol = Cd 1179 Mass Number = 116 1180 Relative Atomic Mass = 115.904755(3) 1181 Isotopic Composition = 7.49(18) 1182 Standard Atomic Weight = 112.411(8) 1183 Notes = g 1184 1185 Atomic Number = 49 1186 Atomic Symbol = In 1187 Mass Number = 113 1188 Relative Atomic Mass = 112.904061(4) 1189 Isotopic Composition = 4.29(5) 1190 Standard Atomic Weight = 114.818(3) 1191 Notes = 1192 1193 Atomic Number = 49 1194 Atomic Symbol = In 1195 Mass Number = 115 1196 Relative Atomic Mass = 114.903878(5) 1197 Isotopic Composition = 95.71(5) 1198 Standard Atomic Weight = 114.818(3) 1199 Notes = 1200 1201 Atomic Number = 50 1202 Atomic Symbol = Sn 1203 Mass Number = 112 1204 Relative Atomic Mass = 111.904821(5) 1205 Isotopic Composition = 0.97(1) 1206 Standard Atomic Weight = 118.710(7) 1207 Notes = g 1208 1209 Atomic Number = 50 1210 Atomic Symbol = Sn 1211 Mass Number = 114 1212 Relative Atomic Mass = 113.902782(3) 1213 Isotopic Composition = 0.66(1) 1214 Standard Atomic Weight = 118.710(7) 1215 Notes = g 1216 1217 Atomic Number = 50 1218 Atomic Symbol = Sn 1219 Mass Number = 115 1220 Relative Atomic Mass = 114.903346(3) 1221 Isotopic Composition = 0.34(1) 1222 Standard Atomic Weight = 118.710(7) 1223 Notes = g 1224 1225 Atomic Number = 50 1226 Atomic Symbol = Sn 1227 Mass Number = 116 1228 Relative Atomic Mass = 115.901744(3) 1229 Isotopic Composition = 14.54(9) 1230 Standard Atomic Weight = 118.710(7) 1231 Notes = g 1232 1233 Atomic Number = 50 1234 Atomic Symbol = Sn 1235 Mass Number = 117 1236 Relative Atomic Mass = 116.902954(3) 1237 Isotopic Composition = 7.68(7) 1238 Standard Atomic Weight = 118.710(7) 1239 Notes = g 1240 1241 Atomic Number = 50 1242 Atomic Symbol = Sn 1243 Mass Number = 118 1244 Relative Atomic Mass = 117.901606(3) 1245 Isotopic Composition = 24.22(9) 1246 Standard Atomic Weight = 118.710(7) 1247 Notes = g 1248 1249 Atomic Number = 50 1250 Atomic Symbol = Sn 1251 Mass Number = 119 1252 Relative Atomic Mass = 118.903309(3) 1253 Isotopic Composition = 8.59(4) 1254 Standard Atomic Weight = 118.710(7) 1255 Notes = g 1256 1257 Atomic Number = 50 1258 Atomic Symbol = Sn 1259 Mass Number = 120 1260 Relative Atomic Mass = 119.9021966(27) 1261 Isotopic Composition = 32.58(9) 1262 Standard Atomic Weight = 118.710(7) 1263 Notes = g 1264 1265 Atomic Number = 50 1266 Atomic Symbol = Sn 1267 Mass Number = 122 1268 Relative Atomic Mass = 121.9034401(29) 1269 Isotopic Composition = 4.63(3) 1270 Standard Atomic Weight = 118.710(7) 1271 Notes = g 1272 1273 Atomic Number = 50 1274 Atomic Symbol = Sn 1275 Mass Number = 124 1276 Relative Atomic Mass = 123.9052746(15) 1277 Isotopic Composition = 5.79(5) 1278 Standard Atomic Weight = 118.710(7) 1279 Notes = g 1280 1281 Atomic Number = 51 1282 Atomic Symbol = Sb 1283 Mass Number = 121 1284 Relative Atomic Mass = 120.9038180(24) 1285 Isotopic Composition = 57.21(5) 1286 Standard Atomic Weight = 121.760(1) 1287 Notes = g 1288 1289 Atomic Number = 51 1290 Atomic Symbol = Sb 1291 Mass Number = 123 1292 Relative Atomic Mass = 122.9042157(22) 1293 Isotopic Composition = 42.79(5) 1294 Standard Atomic Weight = 121.760(1) 1295 Notes = g 1296 1297 Atomic Number = 52 1298 Atomic Symbol = Te 1299 Mass Number = 120 1300 Relative Atomic Mass = 119.904020(11) 1301 Isotopic Composition = 0.09(1) 1302 Standard Atomic Weight = 127.60(3) 1303 Notes = g,h 1304 1305 Atomic Number = 52 1306 Atomic Symbol = Te 1307 Mass Number = 122 1308 Relative Atomic Mass = 121.9030471(20) 1309 Isotopic Composition = 2.55(12) 1310 Standard Atomic Weight = 127.60(3) 1311 Notes = g,h 1312 1313 Atomic Number = 52 1314 Atomic Symbol = Te 1315 Mass Number = 123 1316 Relative Atomic Mass = 122.9042730(19) 1317 Isotopic Composition = 0.89(3) 1318 Standard Atomic Weight = 127.60(3) 1319 Notes = g,h 1320 1321 Atomic Number = 52 1322 Atomic Symbol = Te 1323 Mass Number = 124 1324 Relative Atomic Mass = 123.9028195(16) 1325 Isotopic Composition = 4.74(14) 1326 Standard Atomic Weight = 127.60(3) 1327 Notes = g,h 1328 1329 Atomic Number = 52 1330 Atomic Symbol = Te 1331 Mass Number = 125 1332 Relative Atomic Mass = 124.9044247(20) 1333 Isotopic Composition = 7.07(15) 1334 Standard Atomic Weight = 127.60(3) 1335 Notes = g,h 1336 1337 Atomic Number = 52 1338 Atomic Symbol = Te 1339 Mass Number = 126 1340 Relative Atomic Mass = 125.9033055(20) 1341 Isotopic Composition = 18.84(25) 1342 Standard Atomic Weight = 127.60(3) 1343 Notes = g,h 1344 1345 Atomic Number = 52 1346 Atomic Symbol = Te 1347 Mass Number = 128 1348 Relative Atomic Mass = 127.9044614(19) 1349 Isotopic Composition = 31.74(8) 1350 Standard Atomic Weight = 127.60(3) 1351 Notes = g,h 1352 1353 Atomic Number = 52 1354 Atomic Symbol = Te 1355 Mass Number = 130 1356 Relative Atomic Mass = 129.9062228(21) 1357 Isotopic Composition = 34.08(62) 1358 Standard Atomic Weight = 127.60(3) 1359 Notes = g,h 1360 1361 Atomic Number = 53 1362 Atomic Symbol = I 1363 Mass Number = 127 1364 Relative Atomic Mass = 126.904468(4) 1365 Isotopic Composition = 100 1366 Standard Atomic Weight = 126.90447(3) 1367 Notes = 1368 1369 Atomic Number = 54 1370 Atomic Symbol = Xe 1371 Mass Number = 124 1372 Relative Atomic Mass = 123.9058958(21) 1373 Isotopic Composition = 0.09(1) 1374 Standard Atomic Weight = 131.293(6) 1375 Notes = g,m 1376 1377 Atomic Number = 54 1378 Atomic Symbol = Xe 1379 Mass Number = 126 1380 Relative Atomic Mass = 125.904269(7) 1381 Isotopic Composition = 0.09(1) 1382 Standard Atomic Weight = 131.293(6) 1383 Notes = g,m 1384 1385 Atomic Number = 54 1386 Atomic Symbol = Xe 1387 Mass Number = 128 1388 Relative Atomic Mass = 127.9035304(15) 1389 Isotopic Composition = 1.92(3) 1390 Standard Atomic Weight = 131.293(6) 1391 Notes = g,m 1392 1393 Atomic Number = 54 1394 Atomic Symbol = Xe 1395 Mass Number = 129 1396 Relative Atomic Mass = 128.9047795(9) 1397 Isotopic Composition = 26.44(24) 1398 Standard Atomic Weight = 131.293(6) 1399 Notes = g,m 1400 1401 Atomic Number = 54 1402 Atomic Symbol = Xe 1403 Mass Number = 130 1404 Relative Atomic Mass = 129.9035079(10) 1405 Isotopic Composition = 4.08(2) 1406 Standard Atomic Weight = 131.293(6) 1407 Notes = g,m 1408 1409 Atomic Number = 54 1410 Atomic Symbol = Xe 1411 Mass Number = 131 1412 Relative Atomic Mass = 130.9050819(10) 1413 Isotopic Composition = 21.18(3) 1414 Standard Atomic Weight = 131.293(6) 1415 Notes = g,m 1416 1417 Atomic Number = 54 1418 Atomic Symbol = Xe 1419 Mass Number = 132 1420 Relative Atomic Mass = 131.9041545(12) 1421 Isotopic Composition = 26.89(6) 1422 Standard Atomic Weight = 131.293(6) 1423 Notes = g,m 1424 1425 Atomic Number = 54 1426 Atomic Symbol = Xe 1427 Mass Number = 134 1428 Relative Atomic Mass = 133.9053945(9) 1429 Isotopic Composition = 10.44(10) 1430 Standard Atomic Weight = 131.293(6) 1431 Notes = g,m 1432 1433 Atomic Number = 54 1434 Atomic Symbol = Xe 1435 Mass Number = 136 1436 Relative Atomic Mass = 135.907220(8) 1437 Isotopic Composition = 8.87(16) 1438 Standard Atomic Weight = 131.293(6) 1439 Notes = g,m 1440 1441 Atomic Number = 55 1442 Atomic Symbol = Cs 1443 Mass Number = 133 1444 Relative Atomic Mass = 132.905447(3) 1445 Isotopic Composition = 100 1446 Standard Atomic Weight = 132.90545(2) 1447 Notes = 1448 1449 Atomic Number = 56 1450 Atomic Symbol = Ba 1451 Mass Number = 130 1452 Relative Atomic Mass = 129.906310(7) 1453 Isotopic Composition = 0.106(1) 1454 Standard Atomic Weight = 137.327(7) 1455 Notes = 1456 1457 Atomic Number = 56 1458 Atomic Symbol = Ba 1459 Mass Number = 132 1460 Relative Atomic Mass = 131.905056(3) 1461 Isotopic Composition = 0.101(1) 1462 Standard Atomic Weight = 137.327(7) 1463 Notes = 1464 1465 Atomic Number = 56 1466 Atomic Symbol = Ba 1467 Mass Number = 134 1468 Relative Atomic Mass = 133.904503(3) 1469 Isotopic Composition = 2.417(18) 1470 Standard Atomic Weight = 137.327(7) 1471 Notes = 1472 1473 Atomic Number = 56 1474 Atomic Symbol = Ba 1475 Mass Number = 135 1476 Relative Atomic Mass = 134.905683(3) 1477 Isotopic Composition = 6.592(12) 1478 Standard Atomic Weight = 137.327(7) 1479 Notes = 1480 1481 Atomic Number = 56 1482 Atomic Symbol = Ba 1483 Mass Number = 136 1484 Relative Atomic Mass = 135.904570(3) 1485 Isotopic Composition = 7.854(24) 1486 Standard Atomic Weight = 137.327(7) 1487 Notes = 1488 1489 Atomic Number = 56 1490 Atomic Symbol = Ba 1491 Mass Number = 137 1492 Relative Atomic Mass = 136.905821(3) 1493 Isotopic Composition = 11.232(24) 1494 Standard Atomic Weight = 137.327(7) 1495 Notes = 1496 1497 Atomic Number = 56 1498 Atomic Symbol = Ba 1499 Mass Number = 138 1500 Relative Atomic Mass = 137.905241(3) 1501 Isotopic Composition = 71.698(42) 1502 Standard Atomic Weight = 137.327(7) 1503 Notes = 1504 1505 Atomic Number = 57 1506 Atomic Symbol = La 1507 Mass Number = 138 1508 Relative Atomic Mass = 137.907107(4) 1509 Isotopic Composition = 0.090(1) 1510 Standard Atomic Weight = 138.9055(2) 1511 Notes = g 1512 1513 Atomic Number = 57 1514 Atomic Symbol = La 1515 Mass Number = 139 1516 Relative Atomic Mass = 138.906348(3) 1517 Isotopic Composition = 99.910(1) 1518 Standard Atomic Weight = 138.9055(2) 1519 Notes = g 1520 1521 Atomic Number = 58 1522 Atomic Symbol = Ce 1523 Mass Number = 136 1524 Relative Atomic Mass = 135.907140(50) 1525 Isotopic Composition = 0.185(2) 1526 Standard Atomic Weight = 140.116(1) 1527 Notes = g,f 1528 1529 Atomic Number = 58 1530 Atomic Symbol = Ce 1531 Mass Number = 138 1532 Relative Atomic Mass = 137.905986(11) 1533 Isotopic Composition = 0.251(2) 1534 Standard Atomic Weight = 140.116(1) 1535 Notes = g,f 1536 1537 Atomic Number = 58 1538 Atomic Symbol = Ce 1539 Mass Number = 140 1540 Relative Atomic Mass = 139.905434(3) 1541 Isotopic Composition = 88.450(51) 1542 Standard Atomic Weight = 140.116(1) 1543 Notes = g,f 1544 1545 Atomic Number = 58 1546 Atomic Symbol = Ce 1547 Mass Number = 142 1548 Relative Atomic Mass = 141.909240(4) 1549 Isotopic Composition = 11.114(51) 1550 Standard Atomic Weight = 140.116(1) 1551 Notes = g,f 1552 1553 Atomic Number = 59 1554 Atomic Symbol = Pr 1555 Mass Number = 141 1556 Relative Atomic Mass = 140.907648(3) 1557 Isotopic Composition = 100 1558 Standard Atomic Weight = 140.90765(2) 1559 Notes = 1560 1561 Atomic Number = 60 1562 Atomic Symbol = Nd 1563 Mass Number = 142 1564 Relative Atomic Mass = 141.907719(3) 1565 Isotopic Composition = 27.2(5) 1566 Standard Atomic Weight = 144.24(3) 1567 Notes = g,f 1568 1569 Atomic Number = 60 1570 Atomic Symbol = Nd 1571 Mass Number = 143 1572 Relative Atomic Mass = 142.909810(3) 1573 Isotopic Composition = 12.2(2) 1574 Standard Atomic Weight = 144.24(3) 1575 Notes = g,f 1576 1577 Atomic Number = 60 1578 Atomic Symbol = Nd 1579 Mass Number = 144 1580 Relative Atomic Mass = 143.910083(3) 1581 Isotopic Composition = 23.8(3) 1582 Standard Atomic Weight = 144.24(3) 1583 Notes = g,f 1584 1585 Atomic Number = 60 1586 Atomic Symbol = Nd 1587 Mass Number = 145 1588 Relative Atomic Mass = 144.912569(3) 1589 Isotopic Composition = 8.3(1) 1590 Standard Atomic Weight = 144.24(3) 1591 Notes = g,f 1592 1593 Atomic Number = 60 1594 Atomic Symbol = Nd 1595 Mass Number = 146 1596 Relative Atomic Mass = 145.913112(3) 1597 Isotopic Composition = 17.2(3) 1598 Standard Atomic Weight = 144.24(3) 1599 Notes = g,f 1600 1601 Atomic Number = 60 1602 Atomic Symbol = Nd 1603 Mass Number = 148 1604 Relative Atomic Mass = 147.916889(3) 1605 Isotopic Composition = 5.7(1) 1606 Standard Atomic Weight = 144.24(3) 1607 Notes = g,f 1608 1609 Atomic Number = 60 1610 Atomic Symbol = Nd 1611 Mass Number = 150 1612 Relative Atomic Mass = 149.920887(4) 1613 Isotopic Composition = 5.6(2) 1614 Standard Atomic Weight = 144.24(3) 1615 Notes = g,f 1616 1617 Atomic Number = 61 1618 Atomic Symbol = Pm 1619 Mass Number = 145 1620 Relative Atomic Mass = 144.912744(4) 1621 Isotopic Composition = 1622 Standard Atomic Weight = [145] 1623 Notes = 1624 1625 Atomic Number = 61 1626 Atomic Symbol = Pm 1627 Mass Number = 147 1628 Relative Atomic Mass = 146.915134(3) 1629 Isotopic Composition = 1630 Standard Atomic Weight = [145] 1631 Notes = 1632 1633 Atomic Number = 62 1634 Atomic Symbol = Sm 1635 Mass Number = 144 1636 Relative Atomic Mass = 143.911995(4) 1637 Isotopic Composition = 3.07(7) 1638 Standard Atomic Weight = 150.36(3) 1639 Notes = g 1640 1641 Atomic Number = 62 1642 Atomic Symbol = Sm 1643 Mass Number = 147 1644 Relative Atomic Mass = 146.914893(3) 1645 Isotopic Composition = 14.99(18) 1646 Standard Atomic Weight = 150.36(3) 1647 Notes = g 1648 1649 Atomic Number = 62 1650 Atomic Symbol = Sm 1651 Mass Number = 148 1652 Relative Atomic Mass = 147.914818(3) 1653 Isotopic Composition = 11.24(10) 1654 Standard Atomic Weight = 150.36(3) 1655 Notes = g 1656 1657 Atomic Number = 62 1658 Atomic Symbol = Sm 1659 Mass Number = 149 1660 Relative Atomic Mass = 148.917180(3) 1661 Isotopic Composition = 13.82(7) 1662 Standard Atomic Weight = 150.36(3) 1663 Notes = g 1664 1665 Atomic Number = 62 1666 Atomic Symbol = Sm 1667 Mass Number = 150 1668 Relative Atomic Mass = 149.917271(3) 1669 Isotopic Composition = 7.38(1) 1670 Standard Atomic Weight = 150.36(3) 1671 Notes = g 1672 1673 Atomic Number = 62 1674 Atomic Symbol = Sm 1675 Mass Number = 152 1676 Relative Atomic Mass = 151.919728(3) 1677 Isotopic Composition = 26.75(16) 1678 Standard Atomic Weight = 150.36(3) 1679 Notes = g 1680 1681 Atomic Number = 62 1682 Atomic Symbol = Sm 1683 Mass Number = 154 1684 Relative Atomic Mass = 153.922205(3) 1685 Isotopic Composition = 22.75(29) 1686 Standard Atomic Weight = 150.36(3) 1687 Notes = g 1688 1689 Atomic Number = 63 1690 Atomic Symbol = Eu 1691 Mass Number = 151 1692 Relative Atomic Mass = 150.919846(3) 1693 Isotopic Composition = 47.81(3) 1694 Standard Atomic Weight = 151.964(1) 1695 Notes = g 1696 1697 Atomic Number = 63 1698 Atomic Symbol = Eu 1699 Mass Number = 153 1700 Relative Atomic Mass = 152.921226(3) 1701 Isotopic Composition = 52.19(3) 1702 Standard Atomic Weight = 151.964(1) 1703 Notes = g 1704 1705 Atomic Number = 64 1706 Atomic Symbol = Gd 1707 Mass Number = 152 1708 Relative Atomic Mass = 151.919788(3) 1709 Isotopic Composition = 0.20(1) 1710 Standard Atomic Weight = 157.25(3) 1711 Notes = g 1712 1713 Atomic Number = 64 1714 Atomic Symbol = Gd 1715 Mass Number = 154 1716 Relative Atomic Mass = 153.920862(3) 1717 Isotopic Composition = 2.18(3) 1718 Standard Atomic Weight = 157.25(3) 1719 Notes = g 1720 1721 Atomic Number = 64 1722 Atomic Symbol = Gd 1723 Mass Number = 155 1724 Relative Atomic Mass = 154.922619(3) 1725 Isotopic Composition = 14.80(12) 1726 Standard Atomic Weight = 157.25(3) 1727 Notes = g 1728 1729 Atomic Number = 64 1730 Atomic Symbol = Gd 1731 Mass Number = 156 1732 Relative Atomic Mass = 155.922120(3) 1733 Isotopic Composition = 20.47(9) 1734 Standard Atomic Weight = 157.25(3) 1735 Notes = g 1736 1737 Atomic Number = 64 1738 Atomic Symbol = Gd 1739 Mass Number = 157 1740 Relative Atomic Mass = 156.923957(3) 1741 Isotopic Composition = 15.65(2) 1742 Standard Atomic Weight = 157.25(3) 1743 Notes = g 1744 1745 Atomic Number = 64 1746 Atomic Symbol = Gd 1747 Mass Number = 158 1748 Relative Atomic Mass = 157.924101(3) 1749 Isotopic Composition = 24.84(7) 1750 Standard Atomic Weight = 157.25(3) 1751 Notes = g 1752 1753 Atomic Number = 64 1754 Atomic Symbol = Gd 1755 Mass Number = 160 1756 Relative Atomic Mass = 159.927051(3) 1757 Isotopic Composition = 21.86(19) 1758 Standard Atomic Weight = 157.25(3) 1759 Notes = g 1760 1761 Atomic Number = 65 1762 Atomic Symbol = Tb 1763 Mass Number = 159 1764 Relative Atomic Mass = 158.925343(3) 1765 Isotopic Composition = 100 1766 Standard Atomic Weight = 158.92534(2) 1767 Notes = 1768 1769 Atomic Number = 66 1770 Atomic Symbol = Dy 1771 Mass Number = 156 1772 Relative Atomic Mass = 155.924278(7) 1773 Isotopic Composition = 0.06(1) 1774 Standard Atomic Weight = 162.500(1) 1775 Notes = g 1776 1777 Atomic Number = 66 1778 Atomic Symbol = Dy 1779 Mass Number = 158 1780 Relative Atomic Mass = 157.924405(4) 1781 Isotopic Composition = 0.10(1) 1782 Standard Atomic Weight = 162.500(1) 1783 Notes = g 1784 1785 Atomic Number = 66 1786 Atomic Symbol = Dy 1787 Mass Number = 160 1788 Relative Atomic Mass = 159.925194(3) 1789 Isotopic Composition = 2.34(8) 1790 Standard Atomic Weight = 162.500(1) 1791 Notes = g 1792 1793 Atomic Number = 66 1794 Atomic Symbol = Dy 1795 Mass Number = 161 1796 Relative Atomic Mass = 160.926930(3) 1797 Isotopic Composition = 18.91(24) 1798 Standard Atomic Weight = 162.500(1) 1799 Notes = g 1800 1801 Atomic Number = 66 1802 Atomic Symbol = Dy 1803 Mass Number = 162 1804 Relative Atomic Mass = 161.926795(3) 1805 Isotopic Composition = 25.51(26) 1806 Standard Atomic Weight = 162.500(1) 1807 Notes = g 1808 1809 Atomic Number = 66 1810 Atomic Symbol = Dy 1811 Mass Number = 163 1812 Relative Atomic Mass = 162.928728(3) 1813 Isotopic Composition = 24.90(16) 1814 Standard Atomic Weight = 162.500(1) 1815 Notes = g 1816 1817 Atomic Number = 66 1818 Atomic Symbol = Dy 1819 Mass Number = 164 1820 Relative Atomic Mass = 163.929171(3) 1821 Isotopic Composition = 28.18(37) 1822 Standard Atomic Weight = 162.500(1) 1823 Notes = g 1824 1825 Atomic Number = 67 1826 Atomic Symbol = Ho 1827 Mass Number = 165 1828 Relative Atomic Mass = 164.930319(3) 1829 Isotopic Composition = 100 1830 Standard Atomic Weight = 164.93032(2) 1831 Notes = 1832 1833 Atomic Number = 68 1834 Atomic Symbol = Er 1835 Mass Number = 162 1836 Relative Atomic Mass = 161.928775(4) 1837 Isotopic Composition = 0.14(1) 1838 Standard Atomic Weight = 167.259(3) 1839 Notes = g 1840 1841 Atomic Number = 68 1842 Atomic Symbol = Er 1843 Mass Number = 164 1844 Relative Atomic Mass = 163.929197(4) 1845 Isotopic Composition = 1.61(3) 1846 Standard Atomic Weight = 167.259(3) 1847 Notes = g 1848 1849 Atomic Number = 68 1850 Atomic Symbol = Er 1851 Mass Number = 166 1852 Relative Atomic Mass = 165.930290(3) 1853 Isotopic Composition = 33.61(35) 1854 Standard Atomic Weight = 167.259(3) 1855 Notes = g 1856 1857 Atomic Number = 68 1858 Atomic Symbol = Er 1859 Mass Number = 167 1860 Relative Atomic Mass = 166.932045(3) 1861 Isotopic Composition = 22.93(17) 1862 Standard Atomic Weight = 167.259(3) 1863 Notes = g 1864 1865 Atomic Number = 68 1866 Atomic Symbol = Er 1867 Mass Number = 168 1868 Relative Atomic Mass = 167.932368(3) 1869 Isotopic Composition = 26.78(26) 1870 Standard Atomic Weight = 167.259(3) 1871 Notes = g 1872 1873 Atomic Number = 68 1874 Atomic Symbol = Er 1875 Mass Number = 170 1876 Relative Atomic Mass = 169.935460(3) 1877 Isotopic Composition = 14.93(27) 1878 Standard Atomic Weight = 167.259(3) 1879 Notes = g 1880 1881 Atomic Number = 69 1882 Atomic Symbol = Tm 1883 Mass Number = 169 1884 Relative Atomic Mass = 168.934211(3) 1885 Isotopic Composition = 100 1886 Standard Atomic Weight = 168.93421(2) 1887 Notes = 1888 1889 Atomic Number = 70 1890 Atomic Symbol = Yb 1891 Mass Number = 168 1892 Relative Atomic Mass = 167.933894(5) 1893 Isotopic Composition = 0.13(1) 1894 Standard Atomic Weight = 173.04(3) 1895 Notes = g 1896 1897 Atomic Number = 70 1898 Atomic Symbol = Yb 1899 Mass Number = 170 1900 Relative Atomic Mass = 169.934759(3) 1901 Isotopic Composition = 3.04(15) 1902 Standard Atomic Weight = 173.04(3) 1903 Notes = g 1904 1905 Atomic Number = 70 1906 Atomic Symbol = Yb 1907 Mass Number = 171 1908 Relative Atomic Mass = 170.936322(3) 1909 Isotopic Composition = 14.28(57) 1910 Standard Atomic Weight = 173.04(3) 1911 Notes = g 1912 1913 Atomic Number = 70 1914 Atomic Symbol = Yb 1915 Mass Number = 172 1916 Relative Atomic Mass = 171.9363777(30) 1917 Isotopic Composition = 21.83(67) 1918 Standard Atomic Weight = 173.04(3) 1919 Notes = g 1920 1921 Atomic Number = 70 1922 Atomic Symbol = Yb 1923 Mass Number = 173 1924 Relative Atomic Mass = 172.9382068(30) 1925 Isotopic Composition = 16.13(27) 1926 Standard Atomic Weight = 173.04(3) 1927 Notes = g 1928 1929 Atomic Number = 70 1930 Atomic Symbol = Yb 1931 Mass Number = 174 1932 Relative Atomic Mass = 173.9388581(30) 1933 Isotopic Composition = 31.83(92) 1934 Standard Atomic Weight = 173.04(3) 1935 Notes = g 1936 1937 Atomic Number = 70 1938 Atomic Symbol = Yb 1939 Mass Number = 176 1940 Relative Atomic Mass = 175.942568(3) 1941 Isotopic Composition = 12.76(41) 1942 Standard Atomic Weight = 173.04(3) 1943 Notes = g 1944 1945 Atomic Number = 71 1946 Atomic Symbol = Lu 1947 Mass Number = 175 1948 Relative Atomic Mass = 174.9407679(28) 1949 Isotopic Composition = 97.41(2) 1950 Standard Atomic Weight = 174.967(1) 1951 Notes = g 1952 1953 Atomic Number = 71 1954 Atomic Symbol = Lu 1955 Mass Number = 176 1956 Relative Atomic Mass = 175.9426824(28) 1957 Isotopic Composition = 2.59(2) 1958 Standard Atomic Weight = 174.967(1) 1959 Notes = g 1960 1961 Atomic Number = 72 1962 Atomic Symbol = Hf 1963 Mass Number = 174 1964 Relative Atomic Mass = 173.940040(3) 1965 Isotopic Composition = 0.16(1) 1966 Standard Atomic Weight = 178.49(2) 1967 Notes = f 1968 1969 Atomic Number = 72 1970 Atomic Symbol = Hf 1971 Mass Number = 176 1972 Relative Atomic Mass = 175.9414018(29) 1973 Isotopic Composition = 5.26(7) 1974 Standard Atomic Weight = 178.49(2) 1975 Notes = f 1976 1977 Atomic Number = 72 1978 Atomic Symbol = Hf 1979 Mass Number = 177 1980 Relative Atomic Mass = 176.9432200(27) 1981 Isotopic Composition = 18.60(9) 1982 Standard Atomic Weight = 178.49(2) 1983 Notes = f 1984 1985 Atomic Number = 72 1986 Atomic Symbol = Hf 1987 Mass Number = 178 1988 Relative Atomic Mass = 177.9436977(27) 1989 Isotopic Composition = 27.28(7) 1990 Standard Atomic Weight = 178.49(2) 1991 Notes = f 1992 1993 Atomic Number = 72 1994 Atomic Symbol = Hf 1995 Mass Number = 179 1996 Relative Atomic Mass = 178.9458151(27) 1997 Isotopic Composition = 13.62(2) 1998 Standard Atomic Weight = 178.49(2) 1999 Notes = f 2000 2001 Atomic Number = 72 2002 Atomic Symbol = Hf 2003 Mass Number = 180 2004 Relative Atomic Mass = 179.9465488(27) 2005 Isotopic Composition = 35.08(16) 2006 Standard Atomic Weight = 178.49(2) 2007 Notes = f 2008 2009 Atomic Number = 73 2010 Atomic Symbol = Ta 2011 Mass Number = 180 2012 Relative Atomic Mass = 179.947466(3) 2013 Isotopic Composition = 0.012(2) 2014 Standard Atomic Weight = 180.9479(1) 2015 Notes = 2016 2017 Atomic Number = 73 2018 Atomic Symbol = Ta 2019 Mass Number = 181 2020 Relative Atomic Mass = 180.947996(3) 2021 Isotopic Composition = 99.988(2) 2022 Standard Atomic Weight = 180.9479(1) 2023 Notes = 2024 2025 Atomic Number = 74 2026 Atomic Symbol = W 2027 Mass Number = 180 2028 Relative Atomic Mass = 179.946706(5) 2029 Isotopic Composition = 0.12(1) 2030 Standard Atomic Weight = 183.84(1) 2031 Notes = 2032 2033 Atomic Number = 74 2034 Atomic Symbol = W 2035 Mass Number = 182 2036 Relative Atomic Mass = 181.948206(3) 2037 Isotopic Composition = 26.50(16) 2038 Standard Atomic Weight = 183.84(1) 2039 Notes = 2040 2041 Atomic Number = 74 2042 Atomic Symbol = W 2043 Mass Number = 183 2044 Relative Atomic Mass = 182.9502245(29) 2045 Isotopic Composition = 14.31(4) 2046 Standard Atomic Weight = 183.84(1) 2047 Notes = 2048 2049 Atomic Number = 74 2050 Atomic Symbol = W 2051 Mass Number = 184 2052 Relative Atomic Mass = 183.9509326(29) 2053 Isotopic Composition = 30.64(2) 2054 Standard Atomic Weight = 183.84(1) 2055 Notes = 2056 2057 Atomic Number = 74 2058 Atomic Symbol = W 2059 Mass Number = 186 2060 Relative Atomic Mass = 185.954362(3) 2061 Isotopic Composition = 28.43(19) 2062 Standard Atomic Weight = 183.84(1) 2063 Notes = 2064 2065 Atomic Number = 75 2066 Atomic Symbol = Re 2067 Mass Number = 185 2068 Relative Atomic Mass = 184.9529557(30) 2069 Isotopic Composition = 37.40(2) 2070 Standard Atomic Weight = 186.207(1) 2071 Notes = 2072 2073 Atomic Number = 75 2074 Atomic Symbol = Re 2075 Mass Number = 187 2076 Relative Atomic Mass = 186.9557508(30) 2077 Isotopic Composition = 62.60(2) 2078 Standard Atomic Weight = 186.207(1) 2079 Notes = 2080 2081 Atomic Number = 76 2082 Atomic Symbol = Os 2083 Mass Number = 184 2084 Relative Atomic Mass = 183.952491(3) 2085 Isotopic Composition = 0.02(1) 2086 Standard Atomic Weight = 190.23(3) 2087 Notes = g,r,f 2088 2089 Atomic Number = 76 2090 Atomic Symbol = Os 2091 Mass Number = 186 2092 Relative Atomic Mass = 185.953838(3) 2093 Isotopic Composition = 1.59(3) 2094 Standard Atomic Weight = 190.23(3) 2095 Notes = g,r,f 2096 2097 Atomic Number = 76 2098 Atomic Symbol = Os 2099 Mass Number = 187 2100 Relative Atomic Mass = 186.9557479(30) 2101 Isotopic Composition = 1.96(2) 2102 Standard Atomic Weight = 190.23(3) 2103 Notes = g,r,f 2104 2105 Atomic Number = 76 2106 Atomic Symbol = Os 2107 Mass Number = 188 2108 Relative Atomic Mass = 187.9558360(30) 2109 Isotopic Composition = 13.24(8) 2110 Standard Atomic Weight = 190.23(3) 2111 Notes = g,r,f 2112 2113 Atomic Number = 76 2114 Atomic Symbol = Os 2115 Mass Number = 189 2116 Relative Atomic Mass = 188.9581449(30) 2117 Isotopic Composition = 16.15(5) 2118 Standard Atomic Weight = 190.23(3) 2119 Notes = g,r,f 2120 2121 Atomic Number = 76 2122 Atomic Symbol = Os 2123 Mass Number = 190 2124 Relative Atomic Mass = 189.958445(3) 2125 Isotopic Composition = 26.26(2) 2126 Standard Atomic Weight = 190.23(3) 2127 Notes = g,r,f 2128 2129 Atomic Number = 76 2130 Atomic Symbol = Os 2131 Mass Number = 192 2132 Relative Atomic Mass = 191.961479(4) 2133 Isotopic Composition = 40.78(19) 2134 Standard Atomic Weight = 190.23(3) 2135 Notes = g,r,f 2136 2137 Atomic Number = 77 2138 Atomic Symbol = Ir 2139 Mass Number = 191 2140 Relative Atomic Mass = 190.960591(3) 2141 Isotopic Composition = 37.3(2) 2142 Standard Atomic Weight = 192.217(3) 2143 Notes = 2144 2145 Atomic Number = 77 2146 Atomic Symbol = Ir 2147 Mass Number = 193 2148 Relative Atomic Mass = 192.962924(3) 2149 Isotopic Composition = 62.7(2) 2150 Standard Atomic Weight = 192.217(3) 2151 Notes = 2152 2153 Atomic Number = 78 2154 Atomic Symbol = Pt 2155 Mass Number = 190 2156 Relative Atomic Mass = 189.959930(7) 2157 Isotopic Composition = 0.014(1) 2158 Standard Atomic Weight = 195.078(2) 2159 Notes = 2160 2161 Atomic Number = 78 2162 Atomic Symbol = Pt 2163 Mass Number = 192 2164 Relative Atomic Mass = 191.961035(4) 2165 Isotopic Composition = 0.782(7) 2166 Standard Atomic Weight = 195.078(2) 2167 Notes = 2168 2169 Atomic Number = 78 2170 Atomic Symbol = Pt 2171 Mass Number = 194 2172 Relative Atomic Mass = 193.962664(3) 2173 Isotopic Composition = 32.967(99) 2174 Standard Atomic Weight = 195.078(2) 2175 Notes = 2176 2177 Atomic Number = 78 2178 Atomic Symbol = Pt 2179 Mass Number = 195 2180 Relative Atomic Mass = 194.964774(3) 2181 Isotopic Composition = 33.832(10) 2182 Standard Atomic Weight = 195.078(2) 2183 Notes = 2184 2185 Atomic Number = 78 2186 Atomic Symbol = Pt 2187 Mass Number = 196 2188 Relative Atomic Mass = 195.964935(3) 2189 Isotopic Composition = 25.242(41) 2190 Standard Atomic Weight = 195.078(2) 2191 Notes = 2192 2193 Atomic Number = 78 2194 Atomic Symbol = Pt 2195 Mass Number = 198 2196 Relative Atomic Mass = 197.967876(4) 2197 Isotopic Composition = 7.163(55) 2198 Standard Atomic Weight = 195.078(2) 2199 Notes = 2200 2201 Atomic Number = 79 2202 Atomic Symbol = Au 2203 Mass Number = 197 2204 Relative Atomic Mass = 196.966552(3) 2205 Isotopic Composition = 100 2206 Standard Atomic Weight = 196.96655(2) 2207 Notes = 2208 2209 Atomic Number = 80 2210 Atomic Symbol = Hg 2211 Mass Number = 196 2212 Relative Atomic Mass = 195.965815(4) 2213 Isotopic Composition = 0.15(1) 2214 Standard Atomic Weight = 200.59(2) 2215 Notes = 2216 2217 Atomic Number = 80 2218 Atomic Symbol = Hg 2219 Mass Number = 198 2220 Relative Atomic Mass = 197.966752(3) 2221 Isotopic Composition = 9.97(20) 2222 Standard Atomic Weight = 200.59(2) 2223 Notes = 2224 2225 Atomic Number = 80 2226 Atomic Symbol = Hg 2227 Mass Number = 199 2228 Relative Atomic Mass = 198.968262(3) 2229 Isotopic Composition = 16.87(22) 2230 Standard Atomic Weight = 200.59(2) 2231 Notes = 2232 2233 Atomic Number = 80 2234 Atomic Symbol = Hg 2235 Mass Number = 200 2236 Relative Atomic Mass = 199.968309(3) 2237 Isotopic Composition = 23.10(19) 2238 Standard Atomic Weight = 200.59(2) 2239 Notes = 2240 2241 Atomic Number = 80 2242 Atomic Symbol = Hg 2243 Mass Number = 201 2244 Relative Atomic Mass = 200.970285(3) 2245 Isotopic Composition = 13.18(9) 2246 Standard Atomic Weight = 200.59(2) 2247 Notes = 2248 2249 Atomic Number = 80 2250 Atomic Symbol = Hg 2251 Mass Number = 202 2252 Relative Atomic Mass = 201.970626(3) 2253 Isotopic Composition = 29.86(26) 2254 Standard Atomic Weight = 200.59(2) 2255 Notes = 2256 2257 Atomic Number = 80 2258 Atomic Symbol = Hg 2259 Mass Number = 204 2260 Relative Atomic Mass = 203.973476(3) 2261 Isotopic Composition = 6.87(15) 2262 Standard Atomic Weight = 200.59(2) 2263 Notes = 2264 2265 Atomic Number = 81 2266 Atomic Symbol = Tl 2267 Mass Number = 203 2268 Relative Atomic Mass = 202.972329(3) 2269 Isotopic Composition = 29.524(14) 2270 Standard Atomic Weight = 204.3833(2) 2271 Notes = 2272 2273 Atomic Number = 81 2274 Atomic Symbol = Tl 2275 Mass Number = 205 2276 Relative Atomic Mass = 204.974412(3) 2277 Isotopic Composition = 70.476(14) 2278 Standard Atomic Weight = 204.3833(2) 2279 Notes = 2280 2281 Atomic Number = 82 2282 Atomic Symbol = Pb 2283 Mass Number = 204 2284 Relative Atomic Mass = 203.973029(3) 2285 Isotopic Composition = 1.4(1) 2286 Standard Atomic Weight = 207.2(1) 2287 Notes = g,r,f 2288 2289 Atomic Number = 82 2290 Atomic Symbol = Pb 2291 Mass Number = 206 2292 Relative Atomic Mass = 205.974449(3) 2293 Isotopic Composition = 24.1(1) 2294 Standard Atomic Weight = 207.2(1) 2295 Notes = g,r,f 2296 2297 Atomic Number = 82 2298 Atomic Symbol = Pb 2299 Mass Number = 207 2300 Relative Atomic Mass = 206.975881(3) 2301 Isotopic Composition = 22.1(1) 2302 Standard Atomic Weight = 207.2(1) 2303 Notes = g,r,f 2304 2305 Atomic Number = 82 2306 Atomic Symbol = Pb 2307 Mass Number = 208 2308 Relative Atomic Mass = 207.976636(3) 2309 Isotopic Composition = 52.4(1) 2310 Standard Atomic Weight = 207.2(1) 2311 Notes = g,r,f 2312 2313 Atomic Number = 83 2314 Atomic Symbol = Bi 2315 Mass Number = 209 2316 Relative Atomic Mass = 208.980383(3) 2317 Isotopic Composition = 100 2318 Standard Atomic Weight = 208.98038(2) 2319 Notes = 2320 2321 Atomic Number = 84 2322 Atomic Symbol = Po 2323 Mass Number = 209 2324 Relative Atomic Mass = 208.982416(3) 2325 Isotopic Composition = 2326 Standard Atomic Weight = [209] 2327 Notes = 2328 2329 Atomic Number = 84 2330 Atomic Symbol = Po 2331 Mass Number = 210 2332 Relative Atomic Mass = 209.982857(3) 2333 Isotopic Composition = 2334 Standard Atomic Weight = [209] 2335 Notes = 2336 2337 Atomic Number = 85 2338 Atomic Symbol = At 2339 Mass Number = 210 2340 Relative Atomic Mass = 209.987131(9) 2341 Isotopic Composition = 2342 Standard Atomic Weight = [210] 2343 Notes = 2344 2345 Atomic Number = 85 2346 Atomic Symbol = At 2347 Mass Number = 211 2348 Relative Atomic Mass = 210.987481(4) 2349 Isotopic Composition = 2350 Standard Atomic Weight = [210] 2351 Notes = 2352 2353 Atomic Number = 86 2354 Atomic Symbol = Rn 2355 Mass Number = 211 2356 Relative Atomic Mass = 210.990585(8) 2357 Isotopic Composition = 2358 Standard Atomic Weight = [222] 2359 Notes = 2360 2361 Atomic Number = 86 2362 Atomic Symbol = Rn 2363 Mass Number = 220 2364 Relative Atomic Mass = 220.0113841(29) 2365 Isotopic Composition = 2366 Standard Atomic Weight = [222] 2367 Notes = 2368 2369 Atomic Number = 86 2370 Atomic Symbol = Rn 2371 Mass Number = 222 2372 Relative Atomic Mass = 222.0175705(27) 2373 Isotopic Composition = 2374 Standard Atomic Weight = [222] 2375 Notes = 2376 2377 Atomic Number = 87 2378 Atomic Symbol = Fr 2379 Mass Number = 223 2380 Relative Atomic Mass = 223.0197307(29) 2381 Isotopic Composition = 2382 Standard Atomic Weight = [223] 2383 Notes = 2384 2385 Atomic Number = 88 2386 Atomic Symbol = Ra 2387 Mass Number = 223 2388 Relative Atomic Mass = 223.018497(3) 2389 Isotopic Composition = 2390 Standard Atomic Weight = [226] 2391 Notes = 2392 2393 Atomic Number = 88 2394 Atomic Symbol = Ra 2395 Mass Number = 224 2396 Relative Atomic Mass = 224.0202020(29) 2397 Isotopic Composition = 2398 Standard Atomic Weight = [226] 2399 Notes = 2400 2401 Atomic Number = 88 2402 Atomic Symbol = Ra 2403 Mass Number = 226 2404 Relative Atomic Mass = 226.0254026(27) 2405 Isotopic Composition = 2406 Standard Atomic Weight = [226] 2407 Notes = 2408 2409 Atomic Number = 88 2410 Atomic Symbol = Ra 2411 Mass Number = 228 2412 Relative Atomic Mass = 228.0310641(27) 2413 Isotopic Composition = 2414 Standard Atomic Weight = [226] 2415 Notes = 2416 2417 Atomic Number = 89 2418 Atomic Symbol = Ac 2419 Mass Number = 227 2420 Relative Atomic Mass = 227.0277470(29) 2421 Isotopic Composition = 2422 Standard Atomic Weight = [227] 2423 Notes = 2424 2425 Atomic Number = 90 2426 Atomic Symbol = Th 2427 Mass Number = 230 2428 Relative Atomic Mass = 230.0331266(22) 2429 Isotopic Composition = 2430 Standard Atomic Weight = 232.0381(1) 2431 Notes = g 2432 2433 Atomic Number = 90 2434 Atomic Symbol = Th 2435 Mass Number = 232 2436 Relative Atomic Mass = 232.0380504(22) 2437 Isotopic Composition = 100 2438 Standard Atomic Weight = 232.0381(1) 2439 Notes = g 2440 2441 Atomic Number = 91 2442 Atomic Symbol = Pa 2443 Mass Number = 231 2444 Relative Atomic Mass = 231.0358789(28) 2445 Isotopic Composition = 100 2446 Standard Atomic Weight = 231.03588(2) 2447 Notes = 2448 2449 Atomic Number = 92 2450 Atomic Symbol = U 2451 Mass Number = 233 2452 Relative Atomic Mass = 233.039628(3) 2453 Isotopic Composition = 2454 Standard Atomic Weight = 238.02891(3) 2455 Notes = g,m,r,d,f 2456 2457 Atomic Number = 92 2458 Atomic Symbol = U 2459 Mass Number = 234 2460 Relative Atomic Mass = 234.0409456(21) 2461 Isotopic Composition = 0.0055(2) 2462 Standard Atomic Weight = 238.02891(3) 2463 Notes = g,m,r,d,f 2464 2465 Atomic Number = 92 2466 Atomic Symbol = U 2467 Mass Number = 235 2468 Relative Atomic Mass = 235.0439231(21) 2469 Isotopic Composition = 0.7200(51) 2470 Standard Atomic Weight = 238.02891(3) 2471 Notes = g,m,r,d,f 2472 2473 Atomic Number = 92 2474 Atomic Symbol = U 2475 Mass Number = 236 2476 Relative Atomic Mass = 236.0455619(21) 2477 Isotopic Composition = 2478 Standard Atomic Weight = 238.02891(3) 2479 Notes = g,m,r,d,f 2480 2481 Atomic Number = 92 2482 Atomic Symbol = U 2483 Mass Number = 238 2484 Relative Atomic Mass = 238.0507826(21) 2485 Isotopic Composition = 99.2745(106) 2486 Standard Atomic Weight = 238.02891(3) 2487 Notes = g,m,r,d,f 2488 2489 Atomic Number = 93 2490 Atomic Symbol = Np 2491 Mass Number = 237 2492 Relative Atomic Mass = 237.0481673(21) 2493 Isotopic Composition = 2494 Standard Atomic Weight = [237] 2495 Notes = 2496 2497 Atomic Number = 93 2498 Atomic Symbol = Np 2499 Mass Number = 239 2500 Relative Atomic Mass = 239.0529314(23) 2501 Isotopic Composition = 2502 Standard Atomic Weight = [237] 2503 Notes = 2504 2505 Atomic Number = 94 2506 Atomic Symbol = Pu 2507 Mass Number = 238 2508 Relative Atomic Mass = 238.0495534(21) 2509 Isotopic Composition = 2510 Standard Atomic Weight = [244] 2511 Notes = 2512 2513 Atomic Number = 94 2514 Atomic Symbol = Pu 2515 Mass Number = 239 2516 Relative Atomic Mass = 239.0521565(21) 2517 Isotopic Composition = 2518 Standard Atomic Weight = [244] 2519 Notes = 2520 2521 Atomic Number = 94 2522 Atomic Symbol = Pu 2523 Mass Number = 240 2524 Relative Atomic Mass = 240.0538075(21) 2525 Isotopic Composition = 2526 Standard Atomic Weight = [244] 2527 Notes = 2528 2529 Atomic Number = 94 2530 Atomic Symbol = Pu 2531 Mass Number = 241 2532 Relative Atomic Mass = 241.0568453(21) 2533 Isotopic Composition = 2534 Standard Atomic Weight = [244] 2535 Notes = 2536 2537 Atomic Number = 94 2538 Atomic Symbol = Pu 2539 Mass Number = 242 2540 Relative Atomic Mass = 242.0587368(21) 2541 Isotopic Composition = 2542 Standard Atomic Weight = [244] 2543 Notes = 2544 2545 Atomic Number = 94 2546 Atomic Symbol = Pu 2547 Mass Number = 244 2548 Relative Atomic Mass = 244.064198(5) 2549 Isotopic Composition = 2550 Standard Atomic Weight = [244] 2551 Notes = 2552 2553 Atomic Number = 95 2554 Atomic Symbol = Am 2555 Mass Number = 241 2556 Relative Atomic Mass = 241.0568229(21) 2557 Isotopic Composition = 2558 Standard Atomic Weight = [243] 2559 Notes = 2560 2561 Atomic Number = 95 2562 Atomic Symbol = Am 2563 Mass Number = 243 2564 Relative Atomic Mass = 243.0613727(23) 2565 Isotopic Composition = 2566 Standard Atomic Weight = [243] 2567 Notes = 2568 2569 Atomic Number = 96 2570 Atomic Symbol = Cm 2571 Mass Number = 243 2572 Relative Atomic Mass = 243.0613822(24) 2573 Isotopic Composition = 2574 Standard Atomic Weight = [247] 2575 Notes = 2576 2577 Atomic Number = 96 2578 Atomic Symbol = Cm 2579 Mass Number = 244 2580 Relative Atomic Mass = 244.0627463(21) 2581 Isotopic Composition = 2582 Standard Atomic Weight = [247] 2583 Notes = 2584 2585 Atomic Number = 96 2586 Atomic Symbol = Cm 2587 Mass Number = 245 2588 Relative Atomic Mass = 245.0654856(29) 2589 Isotopic Composition = 2590 Standard Atomic Weight = [247] 2591 Notes = 2592 2593 Atomic Number = 96 2594 Atomic Symbol = Cm 2595 Mass Number = 246 2596 Relative Atomic Mass = 246.0672176(24) 2597 Isotopic Composition = 2598 Standard Atomic Weight = [247] 2599 Notes = 2600 2601 Atomic Number = 96 2602 Atomic Symbol = Cm 2603 Mass Number = 247 2604 Relative Atomic Mass = 247.070347(5) 2605 Isotopic Composition = 2606 Standard Atomic Weight = [247] 2607 Notes = 2608 2609 Atomic Number = 96 2610 Atomic Symbol = Cm 2611 Mass Number = 248 2612 Relative Atomic Mass = 248.072342(5) 2613 Isotopic Composition = 2614 Standard Atomic Weight = [247] 2615 Notes = 2616 2617 Atomic Number = 97 2618 Atomic Symbol = Bk 2619 Mass Number = 247 2620 Relative Atomic Mass = 247.070299(6) 2621 Isotopic Composition = 2622 Standard Atomic Weight = [247] 2623 Notes = 2624 2625 Atomic Number = 97 2626 Atomic Symbol = Bk 2627 Mass Number = 249 2628 Relative Atomic Mass = 249.074980(3) 2629 Isotopic Composition = 2630 Standard Atomic Weight = [247] 2631 Notes = 2632 2633 Atomic Number = 98 2634 Atomic Symbol = Cf 2635 Mass Number = 249 2636 Relative Atomic Mass = 249.074847(3) 2637 Isotopic Composition = 2638 Standard Atomic Weight = [251] 2639 Notes = 2640 2641 Atomic Number = 98 2642 Atomic Symbol = Cf 2643 Mass Number = 250 2644 Relative Atomic Mass = 250.0764000(24) 2645 Isotopic Composition = 2646 Standard Atomic Weight = [251] 2647 Notes = 2648 2649 Atomic Number = 98 2650 Atomic Symbol = Cf 2651 Mass Number = 251 2652 Relative Atomic Mass = 251.079580(5) 2653 Isotopic Composition = 2654 Standard Atomic Weight = [251] 2655 Notes = 2656 2657 Atomic Number = 98 2658 Atomic Symbol = Cf 2659 Mass Number = 252 2660 Relative Atomic Mass = 252.081620(5) 2661 Isotopic Composition = 2662 Standard Atomic Weight = [251] 2663 Notes = 2664 2665 Atomic Number = 99 2666 Atomic Symbol = Es 2667 Mass Number = 252 2668 Relative Atomic Mass = 252.082970(50) 2669 Isotopic Composition = 2670 Standard Atomic Weight = [252] 2671 Notes = 2672 2673 Atomic Number = 100 2674 Atomic Symbol = Fm 2675 Mass Number = 257 2676 Relative Atomic Mass = 257.095099(7) 2677 Isotopic Composition = 2678 Standard Atomic Weight = [257] 2679 Notes = 2680 2681 Atomic Number = 101 2682 Atomic Symbol = Md 2683 Mass Number = 256 2684 Relative Atomic Mass = 256.094050(60) 2685 Isotopic Composition = 2686 Standard Atomic Weight = [258] 2687 Notes = 2688 2689 Atomic Number = 101 2690 Atomic Symbol = Md 2691 Mass Number = 258 2692 Relative Atomic Mass = 258.098425(5) 2693 Isotopic Composition = 2694 Standard Atomic Weight = [258] 2695 Notes = 2696 2697 Atomic Number = 102 2698 Atomic Symbol = No 2699 Mass Number = 259 2700 Relative Atomic Mass = 259.10102(11)# 2701 Isotopic Composition = 2702 Standard Atomic Weight = [259] 2703 Notes = 2704 2705 Atomic Number = 103 2706 Atomic Symbol = Lr 2707 Mass Number = 262 2708 Relative Atomic Mass = 262.10969(32)# 2709 Isotopic Composition = 2710 Standard Atomic Weight = [262] 2711 Notes = 2712 2713 Atomic Number = 104 2714 Atomic Symbol = Rf 2715 Mass Number = 261 2716 Relative Atomic Mass = 261.10875(11)# 2717 Isotopic Composition = 2718 Standard Atomic Weight = [261] 2719 Notes = 2720 2721 Atomic Number = 105 2722 Atomic Symbol = Db 2723 Mass Number = 262 2724 Relative Atomic Mass = 262.11415(20)# 2725 Isotopic Composition = 2726 Standard Atomic Weight = [262] 2727 Notes = 2728 2729 Atomic Number = 106 2730 Atomic Symbol = Sg 2731 Mass Number = 266 2732 Relative Atomic Mass = 266.12193(31)# 2733 Isotopic Composition = 2734 Standard Atomic Weight = [266] 2735 Notes = 2736 2737 Atomic Number = 107 2738 Atomic Symbol = Bh 2739 Mass Number = 264 2740 Relative Atomic Mass = 264.12473(30)# 2741 Isotopic Composition = 2742 Standard Atomic Weight = [264] 2743 Notes = 2744 2745 Atomic Number = 108 2746 Atomic Symbol = Hs 2747 Mass Number = 277 2748 Relative Atomic Mass = 2749 Isotopic Composition = 2750 Standard Atomic Weight = [277] 2751 Notes = 2752 2753 Atomic Number = 109 2754 Atomic Symbol = Mt 2755 Mass Number = 268 2756 Relative Atomic Mass = 268.13882(34)# 2757 Isotopic Composition = 2758 Standard Atomic Weight = [268] 2759 Notes = 2760 2761 Atomic Number = 110 2762 Atomic Symbol = Uun 2763 Mass Number = 281 2764 Relative Atomic Mass = 2765 Isotopic Composition = 2766 Standard Atomic Weight = [281] 2767 Notes = 2768 2769 Atomic Number = 111 2770 Atomic Symbol = Uuu 2771 Mass Number = 272 2772 Relative Atomic Mass = 272.15348(36)# 2773 Isotopic Composition = 2774 Standard Atomic Weight = [272] 2775 Notes = 2776 2777 Atomic Number = 112 2778 Atomic Symbol = Uub 2779 Mass Number = 285 2780 Relative Atomic Mass = 2781 Isotopic Composition = 2782 Standard Atomic Weight = [285] 2783 Notes = 2784 2785 Atomic Number = 2786 Atomic Symbol = XYZ 2787 Mass Number = 2788 Relative Atomic Mass = 2789 Isotopic Composition = 2790 Standard Atomic Weight = 2791 Notes = 2792 2793 Atomic Number = 114 2794 Atomic Symbol = Uuq 2795 Mass Number = 289 2796 Relative Atomic Mass = 2797 Isotopic Composition = 2798 Standard Atomic Weight = [289] 2799 Notes = 2800 2801 Atomic Number = 2802 Atomic Symbol = XYZ 2803 Mass Number = 2804 Relative Atomic Mass = 2805 Isotopic Composition = 2806 Standard Atomic Weight = 2807 Notes = 2808 2809 Atomic Number = 116 2810 Atomic Symbol = Uuh 2811 Mass Number = 292 2812 Relative Atomic Mass = 2813 Isotopic Composition = 2814 Standard Atomic Weight = [292] 2815 Notes = 2816 2817 2818