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| Tlenek żelaza (II), FeO | Fe2+ + O2- ---> FeO |
| Tlenek żelaza (III), Fe2O3 | 2Fe2++3O2- ---> Fe2O3 |
| Izotop | Rozpowszechnienie w przyrodzie | Okres połowicznego zaniku | Typ rozpadu |
| 49Fe | _____ | 80ms | ß+ |
| 51Fe | _____ | 250ms | ß+ |
| 52mFe | _____ | 46s | ß+ |
| 52Fe | _____ | 8,28h | ß+, w. e. |
| 53mFe | _____ | 2,54s | i. t. |
| 53Fe | _____ | 8,51min | ß+ |
| 54Fe | 5,8% | _____ | _____ |
| 55Fe | _____ | 2,7 lat | w. e. |
| 56Fe | 91,72% | _____ | _____ |
| 57Fe | 2,2% | _____ | _____ |
| 58Fe | 0,28% | _____ | _____ |
| 59Fe | _____ | 44,5 dni | ß- |
| 60Fe | _____ | 105 lat | ß- |
| 61Fe | _____ | 6min | ß- |
| 62Fe | _____ | 68s | ß- |
| 63Fe | _____ | 4,9s | ß- |