Fe
Iron
Z 26 55.845 g/molTransition Metal
| 56Fe | 30 | 55.9349 | -60,607.16 | 91.754% | Stable | 0+ | --- | 1923 |
| 54Fe | 28 | 53.9396 | -56,254.6 | 5.845% | Stable | 0+ | β⁺ | 1923 |
| 57Fe | 31 | 56.9354 | -60,182.02 | 2.119% | Stable | 1/2- | --- | 1935 |
| 58Fe | 32 | 57.9333 | -62,155.3 | 0.282% | Stable | 0+ | --- | 1935 |
| 45Fe | 19 | 45.0155 | 14,410.0 | --- | 2.5 ms | (3/2+) | p→43Cr(70%) β⁺p→44Cr(18.9%) β⁺p→43V(7.8%) β⁺→45Mn(3.3%) | 1996 |
| 46Fe | 20 | 46.0013 | 1,210.0 | --- | 13.0 ms | 0+ | β⁺p→45Cr(78.7%) β⁺→46Mn(21.3%) β⁺p→44V | 1992 |
| 47Fe | 21 | 46.9923 | -7,130.0 | --- | 21.9 ms | (7/2-) | β⁺p→46Cr(88.4%) β⁺→47Mn(11.6%) | 1992 |
| 47mFe | 21 | 46.9932 | -6,360.0 | --- | --- | (3/2+) | γ→47Fe | --- |
| 48Fe | 22 | 47.9807 | -18,010.0 | --- | 45.3 ms | 0+ | β⁺→48Mn(84.7%) β⁺p→47Cr(15.3%) | 1987 |
| 49Fe | 23 | 48.9734 | -24,751.0 | --- | 64.7 ms | (7/2-) | β⁺p→48Cr(56.7%) β⁺→49Mn(43.3%) | 1970 |
| 50Fe | 24 | 49.963 | -34,476.0 | --- | 152.0 ms | 0+ | β⁺→50Mn(100%) | 1977 |
| 51Fe | 25 | 50.9569 | -40,189.2 | --- | 305.4 ms | 5/2- | β⁺→51Mn(100%) | 1972 |
| 52Fe | 26 | 51.9481 | -48,332.1 | --- | 8.28 h | 0+ | β⁺→52Mn(100%) | 1948 |
| 52mFe | 26 | 51.9556 | -41,371.43 | --- | 45.9 s | 12+ | β⁺→52Mn(99.979%) γ→52Fe(0.021%) | 1979 |
| 53Fe | 27 | 52.9453 | -50,947.5 | --- | 8.51 m | 7/2- | β⁺→53Mn(100%) | 1938 |
| 53mFe | 27 | 52.9486 | -47,907.1 | --- | 2.54 m | 19/2- | γ→53Fe(100%) | 1967 |
| 54mFe | 28 | 53.9466 | -49,727.5 | --- | 364.0 ns | 10+ | γ→54Fe(100%) | 1983 |
| 55Fe | 29 | 54.9383 | -57,481.4 | --- | 2.76 y | 3/2- | EC→55Mn(100%) | 1939 |
| 59Fe | 33 | 58.9349 | -60,665.0 | --- | 44.5 d | 3/2- | β⁻→59Co(100%) | 1938 |
| 60Fe | 34 | 59.9341 | -61,413.0 | --- | 2.62 My | 0+ | β⁻→60Co(100%) | 1957 |
| 61Fe | 35 | 60.9367 | -58,920.5 | --- | 5.98 m | (3/2-) | β⁻→61Co(100%) | 1957 |
| 61mFe | 35 | 60.9377 | -58,058.8 | --- | 238.0 ns | 9/2+ | γ→61Fe(100%) | 1998 |
| 62Fe | 36 | 61.9368 | -58,878.1 | --- | 1.13 m | 0+ | β⁻→62Co(100%) | 1975 |
| 63Fe | 37 | 62.9403 | -55,636.0 | --- | 6.1 s | (5/2-) | β⁻→63Co(100%) | 1980 |
| 64Fe | 38 | 63.941 | -54,970.0 | --- | 2.0 s | 0+ | β⁻→64Co(100%) | 1980 |
| 65Fe | 39 | 64.945 | -51,218.0 | --- | 805.0 ms | (1/2-) | β⁻→65Co(100%) β⁻n→64Co | 1980 |
| 65mFe | 39 | 64.9454 | -50,824.0 | --- | 1.12 s | (9/2+) | β⁻→65Co | 2008 |
| 65nFe | 39 | 64.9454 | -50,820.0 | --- | 418.0 ns | (5/2+) | γ→65Fe(100%) | 1998 |
| 66Fe | 40 | 65.9462 | -50,068.0 | --- | 467.0 ms | 0+ | β⁻→66Co(100%) β⁻n→65Co | 1985 |
| 67Fe | 41 | 66.9509 | -45,708.0 | --- | 394.0 ms | (1/2-) | β⁻→67Co(100%) β⁻n→66Co | 1985 |
| 67mFe | 41 | 66.9514 | -45,305.0 | --- | 64.0 µs | (5/2+) | γ→67Fe(100%) | 1998 |
| 67nFe | 41 | 66.9514 | -45,260.0 | --- | 75.0 µs | (9/2+) | γ→67Fe(100%) | 2008 |
| 68Fe | 42 | 67.9529 | -43,900.0 | --- | 188.0 ms | 0+ | β⁻→68Co(100%) | 1985 |
| 69Fe | 43 | 68.9579 | -39,200.0 | --- | 162.0 ms | (1/2-) | β⁻→69Co(100%) β⁻n→68Co β⁻n→67Co | 1992 |
| 70Fe | 44 | 69.9604 | -36,890.0 | --- | 61.4 ms | 0+ | β⁻→70Co(100%) β⁻n→69Co | 1997 |
| 71Fe | 45 | 70.9657 | -31,930.0 | --- | 34.3 ms | (7/2+) | β⁻→71Co(100%) β⁻n→70Co β⁻n→69Co | 1997 |
| 72Fe | 46 | 71.9686 | -29,250.0 | --- | 17.0 ms | 0+ | β⁻→72Co(100%) β⁻n→71Co β⁻n→70Co | 1997 |
| 73Fe | 47 | 72.9742 | -23,990.0 | --- | 12.9 ms | (7/2+) | β⁻→73Co(100%) β⁻n→72Co β⁻n→71Co | 2010 |
| 74Fe | 48 | 73.9778 | -20,660.0 | --- | 5.0 ms | 0+ | β⁻→74Co(100%) β⁻n→73Co β⁻n→72Co | 2010 |
| 75Fe | 49 | 74.9842 | -14,700.0 | --- | 9.0 ms | (9/2+) | β⁻→75Co β⁻n→74Co β⁻n→73Co | 2013 |
| 76Fe | 50 | 75.9886 | -10,590.0 | --- | 3.0 ms | 0+ | β⁻→76Co | 2017 |