This table is from "The 1995 Update to the Atomic Mass Evaluation" G. Audi and A.H. Wapstra, _Nuclear Physics_ A595 (1995) 409-480. The mass data here were obtained from: http://www.nea.fr/html/dbdata/mass_rmd_mas95.txt and are the "recommended" values. For more information, see: http://iaeand.iaea.or.at/ndspub/masses/README.MAS95 Isotopic Abundances from: P. De Bievre and P.D.P. Taylor, Int. J. Mass Spectrom. Ion Phys. *123* 149 (1993). Lifetimes from: CRC This table has had many rare isotopes trimmed, to only those that appear in the CRC Handbook's "Table of the Isotopes" with appreciable natural abundances (given) or halflives. For *all* isotopes, see the file "mass3.txt" A Z Element amu +/-*10^6 abundance +/- (or halflife) 1 1 H 1.007825032 0.000 99.985 1 1 2 H 2.014101778 0.000 0.015 1 2 3 He 3.016029310 0.001 0.000137 3 2 4 He 4.002603250 0.001 99.999863 3 3 6 Li 6.015122281 0.510 7.5 2 3 7 Li 7.016004049 0.507 92.5 2 4 9 Be 9.012182135 0.425 100. 5 10 B 10.012937027 0.397 19.9 2 5 11 B 11.009305466 0.451 80.1 2 6 12 C 12.0000000 0.0 98.90 3 6 13 C 13.003354838 0.001 1.10 3 7 14 N 14.003074005 0.001 99.634 9 7 15 N 15.000108898 0.001 0.366 9 8 16 O 15.994914622 0.002 99.762 15 8 17 O 16.999131501 0.223 0.038 3 8 18 O 17.999160419 0.851 0.200 12 9 19 F 18.998403205 0.075 100. 10 20 Ne 19.992440176 0.002 90.48 3 10 21 Ne 20.993846744 0.043 0.27 1 10 22 Ne 21.991385510 0.232 9.25 3 11 23 Na 22.989769675 0.226 100. 12 24 Mg 23.985041898 0.201 78.99 3 12 25 Mg 24.985837023 0.204 10.00 1 12 26 Mg 25.982593040 0.207 11.01 2 13 27 Al 26.981538441 0.135 100. 14 28 Si 27.976926533 0.002 92.23 1 14 29 Si 28.976494719 0.030 4.67 1 14 30 Si 29.973770218 0.045 3.10 1 15 31 P 30.973761512 0.197 100. 16 32 S 31.972070690 0.121 95.02 9 16 33 S 32.971458497 0.117 0.75 4 16 34 S 33.967866831 0.106 4.21 8 16 36 S 35.967080880 0.252 0.02 1 17 35 Cl 34.968852707 0.042 75.77 7 17 37 Cl 36.965902600 0.051 24.23 7 18 36 Ar 35.967546282 0.273 0.337 4 18 38 Ar 37.962732161 0.528 0.063 1 18 40 Ar 39.962383123 0.003 99.600 3 19 39 K 38.963706861 0.301 93.2581 44 19 40 K 39.963998672 0.291 0.0117 1 19 41 K 40.961825972 0.280 6.7302 44 20 40 Ca 39.962591155 0.314 96.941 18 20 42 Ca 41.958618337 0.406 0.647 9 20 43 Ca 42.958766833 0.518 0.135 6 20 44 Ca 43.955481094 0.913 2.086 12 20 46 Ca 45.953692759 2.539 0.004 3 20 48 Ca 47.952533512 4.452 0.187 4 21 45 Sc 44.955910243 1.170 100. 22 46 Ti 45.952629491 1.199 8.0 1 22 47 Ti 46.951763792 1.049 7.3 1 22 48 Ti 47.947947053 1.049 73.8 1 22 49 Ti 48.947870789 1.050 5.5 1 22 50 Ti 49.944792069 1.050 5.4 1 23 50 V 49.947162792 1.405 0.250 2 23 51 V 50.943963675 1.402 99.750 2 24 50 Cr 49.946049607 1.421 4.345 13 24 52 Cr 51.940511904 1.511 83.789 18 24 53 Cr 52.940653781 1.506 9.501 17 24 54 Cr 53.938884921 1.493 2.365 7 25 55 Mn 54.938049636 1.448 100. 26 54 Fe 53.939614836 1.426 5.8 1 26 56 Fe 55.934942133 1.454 91.72 1 26 57 Fe 56.935398707 1.457 2.2 1 26 58 Fe 57.933280458 1.484 0.28 1 27 59 Co 58.933200194 1.525 100. 28 58 Ni 57.935347922 1.547 68.007 9 28 60 Ni 59.930790633 1.522 26.223 8 28 61 Ni 60.931060442 1.526 1.140 1 28 62 Ni 61.928348763 1.540 3.634 2 28 64 Ni 63.927969574 1.554 0.926 1 29 63 Cu 62.929601079 1.540 69.17 3 29 65 Cu 64.927793707 1.858 30.83 3 30 64 Zn 63.929146578 1.794 48.6 3 30 66 Zn 65.926036763 1.650 27.9 2 30 67 Zn 66.927130859 1.668 4.1 1 30 68 Zn 67.924847566 1.743 18.8 4 30 70 Zn 69.925324870 3.572 0.6 1 31 69 Ga 68.925580912 3.254 60.108 9 31 71 Ga 70.924705010 1.894 39.892 9 32 70 Ge 69.924250365 1.870 21.23 4 32 72 Ge 71.922076184 1.569 27.66 3 32 73 Ge 72.923459361 1.568 7.73 1 32 74 Ge 73.921178213 1.568 35.94 2 32 76 Ge 75.921402716 1.581 7.44 2 33 74 As 73.923929076 2.392 100. 34 74 Se 73.922476561 1.616 0.35 2 34 76 Se 75.919214107 1.589 9.36 11 34 77 Se 76.919914610 1.589 7.63 6 34 78 Se 77.917309522 1.597 23.78 9 34 80 Se 79.916521828 2.018 49.61 10 34 82 Se 81.916700000 2.227 8.73 6 35 79 Br 78.918337647 2.046 50.69 7 35 81 Br 80.916291060 3.025 49.31 7 36 78 Kr 77.920386271 7.094 0.35 2 36 80 Kr 79.916378040 4.121 2.25 2 36 82 Kr 81.913484601 2.764 11.6 1 36 83 Kr 82.914135952 3.493 11.5 1 36 84 Kr 83.911506627 3.235 57.0 3 36 86 Kr 85.910610313 1.169 17.3 2 37 85 Rb 84.911789341 2.504 72.165 20 37 87 Rb 86.909183465 2.666 27.835 20 38 84 Sr 83.913424778 3.667 0.56 1 38 86 Sr 85.909262351 2.368 9.86 1 38 87 Sr 86.908879316 2.367 7.0 1 38 88 Sr 87.905614339 2.370 82.58 1 39 89 Y 88.905847902 2.518 100. 40 90 Zr 89.904703679 2.337 51.45 3 40 91 Zr 90.905644968 2.314 11.22 4 40 92 Zr 91.905040106 2.307 17.15 2 40 94 Zr 93.906315765 2.514 17.38 4 40 96 Zr 95.908275675 3.445 2.80 2 41 93 Nb 92.906377543 2.400 100. 42 92 Mo 91.906810480 4.020 14.84 4 42 94 Mo 93.905087578 1.960 9.25 3 42 95 Mo 94.905841487 1.959 15.92 5 42 96 Mo 95.904678904 1.959 16.68 5 42 97 Mo 96.906021033 1.957 9.55 3 42 98 Mo 97.905407846 1.958 24.13 7 42 100 Mo 99.907477149 6.235 9.63 3 43 97 Tc 96.906364843 4.831 0.0 2.6My 43 98 Tc 97.907215692 4.060 0.0 1.5My 43 99 Tc 98.906254554 2.057 0.0 0.2My 44 96 Ru 95.907597681 8.462 5.52 6 44 98 Ru 97.905287111 6.732 1.88 6 44 99 Ru 98.905939307 2.149 12.7 1 44 100 Ru 99.904219664 2.150 12.6 1 44 101 Ru 100.905582219 2.183 17.0 1 44 102 Ru 101.904349503 2.183 31.6 2 44 104 Ru 103.905430145 3.810 18.7 2 45 103 Rh 102.905504182 3.033 100. 46 102 Pd 101.905607716 3.463 1.02 1 46 104 Pd 103.904034912 5.095 11.14 8 46 105 Pd 104.905084046 5.044 22.33 8 46 106 Pd 105.903483087 5.050 27.33 3 46 108 Pd 107.903894451 3.914 26.46 9 46 110 Pd 109.905152385 11.732 11.72 9 47 107 Ag 106.905093020 5.978 51.839 7 47 109 Ag 108.904755514 3.375 48.161 7 48 106 Cd 105.906458007 6.452 1.25 4 48 108 Cd 107.904183403 6.125 0.89 2 48 110 Cd 109.903005578 3.183 12.49 12 48 111 Cd 110.904181628 3.183 12.80 8 48 112 Cd 111.902757226 2.986 24.13 14 48 113 Cd 112.904400947 2.981 12.22 8 48 114 Cd 113.903358121 2.986 28.73 28 48 116 Cd 115.904755434 3.464 7.49 12 49 113 In 112.904061223 3.535 4.3 2 49 115 In 114.903878328 4.536 95.7 2 50 112 Sn 111.904820810 4.531 0.97 1 50 114 Sn 113.902781816 3.393 0.65 1 50 115 Sn 114.903345973 3.202 0.34 1 50 116 Sn 115.901744149 3.202 14.53 1 50 117 Sn 116.902953765 3.127 7.68 7 50 118 Sn 117.901606328 3.082 24.23 11 50 119 Sn 118.903308880 3.004 8.59 4 50 120 Sn 119.902196571 2.698 32.59 10 50 122 Sn 121.903440138 2.892 4.63 3 50 124 Sn 123.905274630 1.494 5.79 5 51 121 Sb 120.903818044 2.432 57.36 8 51 123 Sb 122.904215696 2.153 42.64 8 52 120 Te 119.904019891 11.066 0.096 2 52 122 Te 121.903047064 1.986 2.603 4 52 123 Te 122.904272951 1.941 0.908 2 52 124 Te 123.902819466 1.589 4.816 6 52 125 Te 124.904424718 2.022 7.139 6 52 126 Te 125.903305543 2.012 18.95 1 52 128 Te 127.904461383 1.908 31.69 1 52 130 Te 129.906222753 2.086 33.80 1 53 127 I 126.904468420 3.962 100. 54 124 Xe 123.905895774 2.096 0.10 1 54 126 Xe 125.904268868 6.793 0.09 1 54 128 Xe 127.903530436 1.528 1.91 3 54 129 Xe 128.904779458 0.873 26.4 6 54 130 Xe 129.903507903 0.961 4.1 1 54 131 Xe 130.905081920 1.044 21.2 4 54 132 Xe 131.904154457 1.208 26.9 5 54 134 Xe 133.905394504 0.907 10.4 2 54 136 Xe 135.907219526 7.685 8.9 1 55 134 Cs 133.906713419 3.169 100.0 56 130 Ba 129.906310478 7.391 0.106 2 56 132 Ba 131.905056152 3.353 0.101 2 56 134 Ba 133.904503347 3.180 2.417 27 56 135 Ba 134.905682749 3.199 6.592 18 56 136 Ba 135.904570109 3.199 7.854 36 56 137 Ba 136.905821414 3.199 11.23 4 56 138 Ba 137.905241273 3.199 71.70 7 57 138 La 137.907106826 4.421 0.0902 2 57 139 La 138.906348160 3.452 99.9098 2 58 136 Ce 135.907143574 51.266 0.19 1 58 138 Ce 137.905985574 11.322 0.25 1 58 140 Ce 139.905434035 3.300 88.48 10 58 142 Ce 141.909239733 3.678 11.08 10 59 141 Pr 140.907647726 3.244 100.0 60 142 Nd 141.907718643 3.028 27.13 12 60 143 Nd 142.909809626 3.026 12.18 6 60 144 Nd 143.910082629 3.027 23.80 12 60 145 Nd 144.912568847 3.053 8.30 6 60 146 Nd 145.913112139 3.053 17.19 9 60 148 Nd 147.916888516 3.497 5.76 3 60 150 Nd 149.920886563 3.812 5.64 3 61 145 Pm 144.912743879 3.769 0.0 17.7y 62 144 Sm 143.911994730 3.520 3.1 1 62 147 Sm 146.914893275 3.103 15.0 2 62 148 Sm 147.914817914 3.120 11.3 1 62 149 Sm 148.917179521 3.137 13.8 1 62 150 Sm 149.917271454 3.103 7.4 1 62 152 Sm 151.919728244 3.129 26.7 2 62 154 Sm 153.922205303 3.191 22.7 2 63 151 Eu 150.919846022 3.118 47.8 1.5 63 153 Eu 152.921226219 3.119 52.2 1.5 64 152 Gd 151.919787882 3.171 0.20 1 64 154 Gd 153.920862271 3.164 2.18 3 64 155 Gd 154.922618801 3.166 14.80 5 64 156 Gd 155.922119552 3.166 20.47 4 64 157 Gd 156.923956686 3.168 15.65 3 64 158 Gd 157.924100533 3.169* 24.84 12 64 160 Gd 159.927050616 3.216 21.86 4 65 159 Tb 158.925343135 3.174 100. 66 156 Dy 155.924278273 7.214 0.06 1 66 158 Dy 157.924404637 3.912 0.10 1 66 160 Dy 159.925193718 3.232 2.34 6 66 161 Dy 160.926929595 3.232 18.9 2 66 162 Dy 161.926794731 3.232 25.5 2 66 163 Dy 162.928727532 3.232 24.9 2 66 164 Dy 163.929171165 3.233 28.2 2 67 165 Ho 164.930319169 3.177 100. 68 162 Er 161.928774923 3.999 0.14 1 68 164 Er 163.929196996 3.619 1.61 2 68 166 Er 165.930289970 3.136 33.6 2 68 167 Er 166.932045448 3.126 22.95 15 68 168 Er 167.932367781 3.127 26.8 2 68 170 Er 169.935460334 3.318 14.9 2 69 169 Tm 168.934211117 3.113 100. 70 168 Yb 167.933894465 4.768 0.13 1 70 170 Yb 169.934758652 3.090 3.05 6 70 171 Yb 170.936322297 3.000 14.3 2 70 172 Yb 171.936377696 2.993 21.9 3 70 173 Yb 172.938206756 2.970 16.12 21 70 174 Yb 173.938858101 2.970 31.8 4 70 176 Yb 175.942568409 3.123 12.7 2 71 175 Lu 174.940767904 2.772 97.41 2 71 176 Lu 175.942682399 2.770 2.59 2 72 174 Hf 173.940040159 3.412 0.162 3 72 176 Hf 175.941401828 2.909 5.206 5 72 177 Hf 176.943220013 2.707 18.606 4 72 178 Hf 177.943697732 2.700 27.297 4 72 179 Hf 178.945815073 2.699 13.629 6 72 180 Hf 179.946548760 2.707 35.100 7 73 180 Ta 179.947465655 3.390 0.012 2 73 181 Ta 180.947996346 3.104 99.988 2 74 180 W 179.946705734 5.076 0.13 4 74 182 W 181.948205519 3.063 26.3 2 74 183 W 182.950224458 2.945 14.3 1 74 184 W 183.950932553 2.947 30.67 15 74 186 W 185.954362204 3.112 28.6 2 75 185 Re 184.952955747 2.999 37.40 2 75 187 Re 186.955750787 2.979 62.60 2 76 184 Os 183.952490808 3.181 0.02 1 76 186 Os 185.953838355 3.086 1.58 30 76 187 Os 186.955747928 2.979 1.6 3 76 188 Os 187.955835993 2.980 13.3 7 76 189 Os 188.958144866 2.992 16.1 8 76 190 Os 189.958445210 3.023 26.4 1 76 192 Os 191.961479047 3.756 41.0 8 77 191 Ir 190.960591191 3.081 37.40 2 77 193 Ir 192.962923700 3.083 62.60 2 78 190 Pt 189.959930073 6.606 0.01 1 78 192 Pt 191.961035158 3.649 0.79 6 78 194 Pt 193.962663581 3.142 32.9 6 78 195 Pt 194.964774449 3.142 33.8 6 78 196 Pt 195.964934884 3.142 25.3 6 78 198 Pt 197.967876009 4.500 7.2 2 79 197 Au 196.966551609 3.144 100. 80 196 Hg 195.965814846 4.413 0.15 1 80 198 Hg 197.966751830 3.159 9.97 8 80 199 Hg 198.968262489 3.147 16.87 10 80 200 Hg 199.968308726 3.150 23.10 16 80 201 Hg 200.970285275 3.147 13.18 8 80 202 Hg 201.970625604 3.143 29.88 20 80 204 Hg 203.973475640 3.260 6.87 4 81 203 Tl 202.972329088 3.160 29.524 14 81 205 Tl 204.974412270 3.170 70.476 14 82 204 Pb 203.973028761 3.147 1.4 1 82 206 Pb 205.974449002 3.122 24,1 1 82 207 Pb 206.975880605 3.122 22.1 1 82 208 Pb 207.976635850 3.122 52.4 1 83 209 Bi 208.980383241 3.212 100. 84 208 Po 207.981231059 3.444 0.0 2.9y 84 209 Po 208.982415788 3.469 0.0 103y 84 210 Po 209.982857396 3.123 0.0 138d 85 207 At 206.985775861 22.664 0.0 1.8h 85 208 At 207.986582508 27.731 0.0 1.6h 85 209 At 208.986158678 8.502 0.0 5.5h 85 210 At 209.987131308 8.881 0.0 8.3h 85 211 At 210.987480806 4.092 0.0 7.2h 86 211 Rn 210.990585410 7.665 0.0 15h 86 222 Rn 222.017570472 2.698 0.0 3.8d 87 212 Fr 211.996194988 27.667 0.0 19m 87 222 Fr 222.017543957 22.652 0.0 15m 87 223 Fr 223.019730712 2.912 0.0 22m 88 226 Ra 226.025402555 2.684 0.0 1.6Ky 88 228 Ra 228.031064101 2.668 0.0 5.8y 89 227 Ac 227.027746979 2.908 0.0 21.6y 90 229 Th 229.031755340 3.140 0.0 7.24Ky 90 230 Th 230.033126574 2.166 0.0 80Ky 90 232 Th 232.038050360 2.186 0.0 14By 91 230 Pa 230.034532562 3.713 0.0 18d 92 233 U 233.039628196 3.010 0.16My 92 234 U 234.040945606 2.122 0.0055 5 0.25My 92 235 U 235.043923062 2.115 0.7200 12 0.71By 92 238 U 238.050782583 2.126 99.2745 60 4.5By 93 237 Np 237.048167253 2.105 0.0 2.1My 94 239 Pu 239.052156519 2.116 0.0 24.4Ky 94 240 Pu 240.053807460 2.090 0.0 6.6Ky 94 242 Pu 242.058736847 2.111 0.0 0.39My 94 244 Pu 244.064197650 5.467 0.0 80My 95 241 Am 241.056822944 2.101 0.0 458y 95 243 Am 243.061372686 2.338 0.0 7.4Ky 96 245 Cm 245.065485586 2.914 0.0 9.3Ky 96 246 Cm 246.067217551 2.362 0.0 5.5Ky 96 247 Cm 247.070346811 4.760 0.0 16My 96 248 Cm 248.072342247 5.470 0.0 0.5My 96 250 Cm 250.078350687 12.049 0.0 17Ky 97 247 Bk 247.070298533 5.936 0.0 1.4Ky 98 248 Cf 248.072178080 5.843 0.0 360d 98 249 Cf 249.074846818 3.013 0.0 360y 98 251 Cf 251.079580056 4.880 0.0 800y 99 252 Es 252.082972247 53.955 0.0 140d 99 254 Es 254.088016026 4.711 0.0 276d 100 253 Fm 253.085176259 5.302 0.0 3d 100 257 Fm 257.095098635 6.836 0.0 80d 101 255 Md 255.091075196 7.568 0.0 0.6h 101 256 Md 256.094052757 56.707 0.0 1.5h 101 257 Md 257.095534643 3.541 0.0 3h 102 255 No 255.093232449 12.707 0.0 3m 103 256 Lr 256.098763# 236# 0.0 8s 104 261 Rf 261.108752# 114# 0.0 65s 105 262 Db 262.114153# 195# 0.0 34s 106 266 Sg 266.121928# 309# 0.0 20s 107 264 Bh 264.124730# 297# 0.0 0.44s 108 269 Hs 269.134114# 455# 0.0 20s 109 268 Mt 268.138816# 338# 0.0 70ms 110 271 Xa 271.146078# 197# 0.0 60ms 111 272 Xb 272.153477# 356# 0.0 2 ms +++++end file massabun.txt+++++