Isotopic Abundance P. De Bievre and P.D.P. Taylor, Int. J. Mass Spectrom. Ion Phys. 123, 149 (1993). -------------------------------------------- A-El Z Abundance -------------------------------------------- 1H 1 99.985 1 2H 1 0.015 1 3He 2 0.000137 3 4He 2 99.999863 3 6Li 3 7.5 2 7Li 3 92.5 2 9Be 4 100 10B 5 19.9 2 11B 5 80.1 2 12C 6 98.90 3 13C 6 1.10 3 14N 7 99.634 9 15N 7 0.366 9 16O 8 99.762 15 17O 8 0.038 3 18O 8 0.200 12 19F 9 100 20Ne 10 90.48 3 21Ne 10 0.27 1 22Ne 10 9.25 3 23Na 11 100 24Mg 12 78.99 3 25Mg 12 10.00 1 26Mg 12 11.01 2 27Al 13 100 28Si 14 92.23 1 29Si 14 4.67 1 30Si 14 3.10 1 31P 15 100 32S 16 95.02 9 33S 16 0.75 4 34S 16 4.21 8 35Cl 17 75.77 7 36S 16 0.02 1 36Ar 18 0.337 3 37Cl 17 24.23 7 38Ar 18 0.063 1 39K 19 93.2581 44 40Ar 18 99.600 3 40K 19 0.0117 1 40Ca 20 96.941 18 41K 19 6.7302 44 42Ca 20 0.647 9 43Ca 20 0.135 6 44Ca 20 2.086 12 45Sc 21 100 46Ca 20 0.004 3 46Ti 22 8.0 1 47Ti 22 7.3 1 48Ca 20 0.187 4 48Ti 22 73.8 1 49Ti 22 5.5 1 50Ti 22 5.4 1 50V 23 0.250 2 50Cr 24 4.345 13 51V 23 99.750 2 52Cr 24 83.789 18 53Cr 24 9.501 17 54Cr 24 2.365 7 54Fe 26 5.8 1 55Mn 25 100 56Fe 26 91.72 30 57Fe 26 2.2 1 58Fe 26 0.28 1 58Ni 28 68.077 9 59Co 27 100 60Ni 28 26.223 8 61Ni 28 1.140 1 62Ni 28 3.634 2 63Cu 29 69.17 3 64Ni 28 0.926 1 64Zn 30 48.6 3 65Cu 29 30.83 3 66Zn 30 27.9 2 67Zn 30 4.1 1 68Zn 30 18.8 4 69Ga 31 60.108 9 70Zn 30 0.6 1 70Gr 32 21.23 4 71Ga 31 39.892 9 72Ge 32 27.66 3 73Ge 32 7.73 1 74Ge 32 35.94 2 74Se 34 0.89 2 75As 33 100 76Ge 32 7.44 2 76Se 34 9.36 11 77Se 34 7.63 6 78Se 34 23.78 9 78Kr 36 0.35 2 79Br 35 50.69 7 80Se 34 49.61 10 80Kr 36 2.25 2 81Br 35 49.31 7 82Se 34 8.73 6 82Kr 36 11.6 1 83Kr 36 11.5 1 84Kr 36 57.0 3 84Sr 38 0.56 1 85Rb 37 72.165 20 86Kr 36 17.3 2 86Sr 38 9.86 1 87Rb 37 27.835 20 87Sr 38 7.00 1 88Sr 38 82.58 1 89Y 39 100 90Zr 40 51.45 3 91Zr 40 11.22 4 92Zr 40 17.15 2 92Mo 42 14.84 4 93Nb 41 100 94Zr 40 17.38 4 94Mo 42 9.25 3 95Mo 42 15.92 5 96Zr 40 2.80 2 96Mo 42 16.68 5 96Ru 44 5.52 6 97Mo 42 9.55 3 98Mo 42 24.13 7 98Ru 44 1.88 6 99Ru 44 12.7 1 100Mo 42 9.63 3 100Ru 44 12.6 1 101Ru 44 17.0 1 102Ru 44 31.6 2 102Pd 46 1.02 1 103Rh 45 100 104Ru 44 18.7 2 104Pd 46 11.14 8 105Pd 46 22.33 8 106Pd 46 27.33 3 106Cd 48 1.25 4 107Ag 47 51.839 7 108Pd 46 26.46 9 108Cd 48 0.89 2 109Ag 47 48.161 7 110Pd 46 11.72 9 110Cd 48 12.49 12 111Cd 48 12.80 8 112Cd 48 24.13 14 112Sn 50 0.97 1 113Cd 48 12.22 8 113In 49 4.3 2 114Cd 48 28.73 28 114Sn 50 0.65 1 115In 49 95.7 2 115Sn 50 0.34 1 116Cd 48 7.49 12 116Sn 50 14.53 1 117Sn 50 7.68 7 118Sn 50 24.23 11 119Sn 50 8.59 4 120Sn 50 32.59 10 120Te 52 0.096 2 121Sb 51 57.36 8 122Sn 50 4.63 3 122Te 52 2.603 4 123Sb 51 42.64 8 123Te 52 0.908 2 124Sn 50 5.79 5 124Te 52 4.816 6 124Xe 54 0.10 1 125Te 52 7.139 6 126Te 52 18.95 1 126Xe 54 0.09 1 127I 53 100 128Te 52 31.69 1 128Xe 54 1.91 3 129Xe 54 26.4 6 130Te 52 33.80 1 130Xe 54 4.1 1 130Ba 56 0.106 2 131Xe 54 21.2 4 132Xe 54 26.9 5 132Ba 56 0.101 2 133Cs 55 100 134Xe 54 10.4 2 134Ba 56 2.417 27 135Ba 56 6.592 18 136Xe 54 8.9 1 136Ba 56 7.854 36 136Ce 58 0.19 1 137Ba 56 11.23 4 138Ba 56 71.70 7 138La 57 0.0902 2 138Ce 58 0.25 1 139La 57 99.9098 2 140Ce 58 88.48 10 141Pr 59 100 142Ce 58 11.08 10 142Nd 60 27.13 12 143Nd 60 12.18 6 144Nd 60 23.80 12 144Sm 62 3.1 1 145Nd 60 8.30 6 146Nd 60 17.19 9 147Sm 62 15.0 2 148Nd 60 5.76 3 148Sm 62 11.3 1 149Sm 62 13.8 1 150Nd 60 5.64 3 150Sm 62 7.4 1 151Eu 63 47.8 15 152Sm 62 26.7 2 152Gd 64 0.20 1 153Eu 63 52.2 15 154Sm 62 22.7 2 154Gd 64 2.18 3 155Gd 64 14.80 5 156Gd 64 20.47 4 156Dy 66 0.06 1 157Gd 64 15.65 3 158Gd 64 24.84 12 158Dy 66 0.10 1 159Tb 65 100 160Gd 64 21.86 4 160Dy 66 2.34 6 161Dy 66 18.9 2 162Dy 66 25.5 2 162Er 68 0.14 1 163Dy 66 24.9 2 164Dy 66 28.2 2 164Er 68 1.61 2 165Ho 67 100 166Er 68 33.6 2 167Er 68 22.95 15 168Er 68 26.8 2 168Yb 70 0.13 1 169Tm 69 100 170Er 68 14.9 2 170Yb 70 3.05 6 171Yb 70 14.3 2 172Yb 70 21.9 3 173Yb 70 16.12 21 174Yb 70 31.8 4 174Hf 72 0.162 3 175Lu 71 97.41 2 176Yb 70 12.7 2 176Lu 71 2.59 2 176Hf 72 5.206 5 177Hf 72 18.606 4 178Hf 72 27.297 4 179Hf 72 13.629 6 180Hf 72 35.100 7 180Ta 73 0.012 2 180W 74 0.13 4 181Ta 73 99.988 2 182W 74 26.3 2 183W 74 14.3 1 184W 74 30.67 15 184Os 76 0.02 1 185Re 75 37.40 2 186W 74 28.6 2 186Os 76 1.58 30 187Re 75 62.60 2 187Os 76 1.6 3 188Os 76 13.3 7 189Os 76 16.1 8 190Os 76 26.4 12 190Pt 78 0.01 1 191Ir 77 37.3 5 192Os 76 41.0 8 192Pt 78 0.79 6 193Ir 77 62.7 5 194Pt 78 32.9 6 195Pt 78 33.8 6 196Pt 78 25.3 6 196Hg 80 0.15 1 197Au 79 100 198Pt 78 7.2 2 198Hg 80 9.97 8 199Hg 80 16.87 10 200Hg 80 23.10 16 201Hg 80 13.18 8 202Hg 80 29.86 20 203Tl 81 29.524 14 204Hg 80 6.87 4 204Pb 82 1.4 1 205Tl 81 70.476 14 206Pb 82 24.1 1 207Pb 82 22.1 1 208Pb 82 52.4 1 209Bi 83 100 232Th 90 100 234U 92 0.0055 5 235U 92 0.7200 12 238U 92 99.2745 60 -----------------------