Ca
Кальцій
Z 20 40,078 г/мольЛужноземельний метал
| 40Ca | 20 | 39,9626 | -34 846,402 | 96,941% | Стабільний | 0+ | β⁺ | 1922 |
| 44Ca | 24 | 43,9555 | -41 468,7 | 2,086% | Стабільний | 0+ | --- | 1922 |
| 42Ca | 22 | 41,9586 | -38 547,29 | 0,647% | Стабільний | 0+ | --- | 1934 |
| 48Ca | 28 | 47,9525 | -44 224,868 | 0,187% | 56,0 Ер | 0+ | β⁻ β⁻→48Sc | 1938 |
| 43Ca | 23 | 42,9588 | -38 408,87 | 0,135% | Стабільний | 7/2- | --- | 1934 |
| 46Ca | 26 | 45,9537 | -43 139,6 | 0,004% | Стабільний | 0+ | β⁻ | 1938 |
| 33Ca | 13 | 33,0333 | 31 030,0 | --- | --- | (5/2+) | p→32K | --- |
| 34Ca | 14 | 34,016 | 14 890,0 | --- | --- | 0+ | p→32Ar | --- |
| 35Ca | 15 | 35,0056 | 5 190,0 | --- | 25,7 мс | (1/2+) | β⁺p→34Ar(95,8%) β⁺p→33Cl(4,2%) | 1985 |
| 36Ca | 16 | 35,9931 | -6 450,0 | --- | 100,9 мс | 0+ | β⁺p→35Ar(51,2%) β⁺→36K(48,8%) | 1977 |
| 37Ca | 17 | 36,9859 | -13 136,1 | --- | 181,0 мс | 3/2+ | β⁺p→36Ar(76,8%) β⁺→37K(23,2%) | 1964 |
| 38Ca | 18 | 37,9763 | -22 058,5 | --- | 443,7 мс | 0+ | β⁺→38K(100%) | 1966 |
| 39Ca | 19 | 38,9707 | -27 282,7 | --- | 860,3 мс | 3/2+ | β⁺→39K(100%) | 1943 |
| 41Ca | 21 | 40,9623 | -35 137,91 | --- | 99,4 кр | 7/2- | EC→41K(100%) | 1939 |
| 45Ca | 25 | 44,9562 | -40 812,2 | --- | 162,61 д | 7/2- | β⁻→45Sc(100%) | 1940 |
| 47Ca | 27 | 46,9545 | -42 344,7 | --- | 4,54 д | 7/2- | β⁻→47Sc(100%) | 1951 |
| 49Ca | 29 | 48,9557 | -41 300,0 | --- | 8,72 хв | 3/2- | β⁻→49Sc(100%) | 1950 |
| 50Ca | 30 | 49,9575 | -39 589,2 | --- | 13,45 с | 0+ | β⁻→50Sc(100%) | 1964 |
| 51Ca | 31 | 50,961 | -36 332,3 | --- | 10,0 с | 3/2- | β⁻→51Sc(100%) β⁻n→50Sc | 1980 |
| 52Ca | 32 | 51,9632 | -34 266,3 | --- | 4,6 с | 0+ | β⁻→52Sc(100%) β⁻n→51Sc(<2%) | 1985 |
| 53Ca | 33 | 52,9684 | -29 390,0 | --- | 461,0 мс | (1/2-) | β⁻→53Sc(60%) β⁻n→52Sc(40%) | 1983 |
| 54Ca | 34 | 53,973 | -25 160,0 | --- | 90,0 мс | 0+ | β⁻→54Sc(100%) β⁻n→53Sc β⁻n→52Sc | 1997 |
| 55Ca | 35 | 54,98 | -18 650,0 | --- | 22,0 мс | (5/2-) | β⁻→55Sc(100%) β⁻n→54Sc β⁻n→53Sc | 1997 |
| 56Ca | 36 | 55,9855 | -13 510,0 | --- | 11,0 мс | 0+ | β⁻→56Sc(100%) β⁻n→55Sc β⁻n→54Sc | 1997 |
| 57Ca | 37 | 56,993 | -6 560,0 | --- | 8,0 мс | (5/2-) | β⁻→57Sc β⁻n→56Sc β⁻n→55Sc | 2009 |
| 58Ca | 38 | 57,9984 | -1 530,0 | --- | 4,0 мс | 0+ | β⁻→58Sc β⁻n→57Sc β⁻n→56Sc | 2009 |
| 59Ca | 39 | 59,0062 | 5 810,0 | --- | 5,0 мс | (5/2-) | β⁻→59Sc β⁻n→58Sc β⁻n→57Sc | 2018 |
| 60Ca | 40 | 60,0118 | 11 000,0 | --- | 2,0 мс | 0+ | β⁻→60Sc β⁻n→59Sc β⁻n→58Sc | 2018 |
| 61Ca | 41 | 61,0204 | 19 010,0 | --- | 1,0 мс | (1/2-) | β⁻→61Sc β⁻n→60Sc β⁻n→59Sc | --- |