K
Potassium
Z 19 39.098 g/molAlkali Metal
| 39K | 20 | 38.9637 | -33,807.195 | 93.2581% | Stable | 3/2+ | --- | 1921 |
| 41K | 22 | 40.9618 | -35,559.549 | 6.7302% | Stable | 3/2+ | --- | 1921 |
| 40K | 21 | 39.964 | -33,535.5 | 0.0117% | 1.25 Gy | 4- | β⁻→40Ca(89.28%) β⁺→40Ar(10.72%) | 1935 |
| 31K | 12 | 31.0368 | 34,260.0 | --- | --- | (3/2+) | p(100%) | 2019 |
| 32K | 13 | 32.0236 | 21,990.0 | --- | --- | (1+) | p→31Ar | --- |
| 32mK | 13 | 32.0246 | 22,940.0 | --- | --- | (4+) | p→31Ar | --- |
| 33K | 14 | 33.0081 | 7,540.0 | --- | --- | (3/2+) | p→32Ar | --- |
| 34K | 15 | 33.9987 | -1,220.0 | --- | --- | (1+) | p→33Ar | --- |
| 35K | 16 | 34.988 | -11,172.9 | --- | 175.2 ms | 3/2+ | β⁺→35Ar(99.63%) β⁺p→34Cl(0.37%) | 1976 |
| 36K | 17 | 35.9813 | -17,417.2 | --- | 341.0 ms | 2+ | β⁺→36Ar(99.949%) β⁺p→35Cl(0.048%) β⁺α→32S(0.003%) | 1967 |
| 37K | 18 | 36.9734 | -24,800.2 | --- | 1.24 s | 3/2+ | β⁺→37Ar(100%) | 1958 |
| 38K | 19 | 37.9691 | -28,800.76 | --- | 7.65 m | 3+ | β⁺→38Ar(100%) | 1937 |
| 38mK | 19 | 37.9692 | -28,670.61 | --- | 924.35 ms | 0+ | β⁺→38Ar(99.967%) γ→38K(0.033%) | 1953 |
| 38nK | 19 | 37.9728 | -25,342.66 | --- | 21.95 µs | (7+) | γ→38K(100%) | 1971 |
| 40mK | 21 | 39.9658 | -31,891.86 | --- | 336.0 ns | 0+ | γ→40K(100%) | 1968 |
| 42K | 23 | 41.9624 | -35,022.03 | --- | 12.36 h | 2- | β⁻→42Ca(100%) | 1935 |
| 43K | 24 | 42.9607 | -36,575.4 | --- | 22.3 h | 3/2+ | β⁻→43Ca(100%) | 1949 |
| 43mK | 24 | 42.9615 | -35,837.1 | --- | 200.0 ns | 7/2- | γ→43K(100%) | 1978 |
| 44K | 25 | 43.9616 | -35,781.5 | --- | 22.13 m | 2- | β⁻→44Ca(100%) | 1954 |
| 45K | 26 | 44.9607 | -36,615.6 | --- | 17.8 m | 3/2+ | β⁻→45Ca(100%) | 1964 |
| 46K | 27 | 45.962 | -35,413.9 | --- | 1.61 m | 2- | β⁻→46Ca(100%) | 1965 |
| 47K | 28 | 46.9617 | -35,712.0 | --- | 17.38 s | 1/2+ | β⁻→47Ca(100%) | 1964 |
| 48K | 29 | 47.9653 | -32,284.5 | --- | 6.83 s | 1- | β⁻→48Ca(98.86%) β⁻n→47Ca(1.14%) | 1972 |
| 49K | 30 | 48.9682 | -29,611.5 | --- | 1.26 s | 1/2+ | β⁻n→48Ca(86%) β⁻→49Ca(14%) | 1972 |
| 50K | 31 | 49.9724 | -25,728.0 | --- | 472.0 ms | 0- | β⁻→50Ca(71.4%) β⁻n→49Ca(28.6%) β⁻n→48Ca | 1972 |
| 50mK | 31 | 49.9726 | -25,556.0 | --- | 125.0 ns | (2-) | γ→50K(100%) | 1999 |
| 51K | 32 | 50.9758 | -22,515.0 | --- | 365.0 ms | 3/2+ | β⁻n→50Ca(65%) β⁻→51Ca(35%) β⁻n→49Ca | 1983 |
| 52K | 33 | 51.9816 | -17,140.0 | --- | 110.0 ms | (2-) | β⁻n→51Ca(72.2%) β⁻→52Ca(25.5%) β⁻n→50Ca(2.3%) | 1983 |
| 53K | 34 | 52.9868 | -12,300.0 | --- | 30.0 ms | 3/2+ | β⁻n→52Ca(64%) β⁻→53Ca(26%) β⁻n→51Ca(10%) | 1983 |
| 54K | 35 | 53.9945 | -5,150.0 | --- | 10.0 ms | (2-) | β⁻→54Ca(100%) β⁻n→53Ca β⁻n→52Ca | 1983 |
| 55K | 36 | 55.0005 | 470.0 | --- | 10.0 ms | (3/2+) | β⁻→55Ca β⁻n→54Ca β⁻n→53Ca | 2009 |
| 56K | 37 | 56.0086 | 7,980.0 | --- | 5.0 ms | (2-) | β⁻→56Ca β⁻n→55Ca β⁻n→54Ca | 2009 |
| 57K | 38 | 57.0152 | 14,130.0 | --- | 2.0 ms | (3/2+) | β⁻→57Ca β⁻n→56Ca β⁻n→55Ca | 2018 |
| 58K | 39 | 58.0235 | 21,930.0 | --- | 2.0 ms | (2-) | β⁻→58Ca β⁻n→57Ca β⁻n→56Ca | 2019 |
| 59K | 40 | 59.0309 | 28,750.0 | --- | 1.0 ms | (3/2+) | β⁻→59Ca β⁻n→58Ca β⁻n→57Ca | 2018 |