M = Metal / O = Oxide / E = Element / G = Gas / C = Carbonate / CI = Chloride
Selenium
| Isotopes | Chemical form | Natural abundance % |
| 74Se | E | 0.9 |
| 76Se | E | 9.0 |
| 77Se | E | 7.6 |
| 78Se | E | 23.5 |
| 80Se | E | 49.6 |
| 82Se | E | 9.4 |
| Isotopes | Chemical form | Natural abundance % |
| 74Se | E | 0.9 |
| 76Se | E | 9.0 |
| 77Se | E | 7.6 |
| 78Se | E | 23.5 |
| 80Se | E | 49.6 |
| 82Se | E | 9.4 |
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