M = Metal / O = Oxide / E = Element / G = Gas / C = Carbonate / CI = Chloride
Europium
| Isotopes | Chemical form | Natural abundance % |
| 151Eu | O | 47.77 |
| 153Eu | O | 52.23 |

| Isotopes | Chemical form | Natural abundance % |
| 151Eu | O | 47.77 |
| 153Eu | O | 52.23 |
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