M = Metal / O = Oxide / E = Element / G = Gas / C = Carbonate / CI = Chloride
Erbium
| Isotopes | Chemical form | Natural abundance % |
| 162Er | O | 0.136 |
| 164Er | O | 1.56 |
| 166Er | O | 33.41 |
| 167Er | O | 22.94 |
| 168Er | O | 22.07 |
| 170Er | O | 14.88 |
| Isotopes | Chemical form | Natural abundance % |
| 162Er | O | 0.136 |
| 164Er | O | 1.56 |
| 166Er | O | 33.41 |
| 167Er | O | 22.94 |
| 168Er | O | 22.07 |
| 170Er | O | 14.88 |
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