| Proton | Neutron | Nuclear Spin | Energy State | |
|---|---|---|---|---|
| 45Fe | 26 | 19 | 3/2 | |
| 46Fe | 26 | 20 | 0 | |
| 47Fe | 26 | 21 | -7/2 | |
| 48Fe | 26 | 22 | 0 | |
| 49Fe | 26 | 23 | -7/2 | |
| 50Fe | 26 | 24 | 0 | |
| 51Fe | 26 | 25 | -5/2 | |
| 52Fe | 26 | 26 | 0 | |
| 52mFe | 26 | 26 | 12 | |
| 53Fe | 26 | 27 | -7/2 | |
| 53mFe | 26 | 27 | -19/2 | |
| 54Fe | 26 | 28 | 0 | Stable |
| 54mFe | 26 | 28 | 10 | |
| 55Fe | 26 | 29 | -3/2 | |
| 56Fe | 26 | 30 | 0 | Stable |
| 57Fe | 26 | 31 | -1/2 | Stable |
| 58Fe | 26 | 32 | 0 | Stable |
| 59Fe | 26 | 33 | -3/2 | |
| 60Fe | 26 | 34 | 0 | |
| 62Fe | 26 | 36 | 0 | |
| 63Fe | 26 | 37 | -5/2 | |
| 64Fe | 26 | 38 | 0 | |
| 65Fe | 26 | 39 | -1/2 | |
| 65mFe | 26 | 39 | -5/2 | |
| 66Fe | 26 | 40 | 0 | |
| 67Fe | 26 | 41 | -1/2 | |
| 67mFe | 26 | 41 | -5/2 | |
| 68Fe | 26 | 42 | 0 | |
| 69Fe | 26 | 43 | -1/2 | |
| 70Fe | 26 | 44 | 0 | |
| 71Fe | 26 | 45 | 7/2 | |
| 72Fe | 26 | 46 | 0 |