M = Metal / O = Oxide / E = Element / G = Gas / C = Carbonate / CI = Chloride
Gadolinium
| Isotopes | Chemical form | Natural abundance % |
| 152Gd | O | 0.20 |
| 154Gd | O | 2.15 |
| 155Gd | O | 14.78 |
| 156Gd | O | 20.59 |
| 157Gd | O | 15.71 |
| 158Gd | O | 24.78 |
| 160Gd | O | 21.79 |
| Isotopes | Chemical form | Natural abundance % |
| 152Gd | O | 0.20 |
| 154Gd | O | 2.15 |
| 155Gd | O | 14.78 |
| 156Gd | O | 20.59 |
| 157Gd | O | 15.71 |
| 158Gd | O | 24.78 |
| 160Gd | O | 21.79 |
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