Ar
Аргон
Z 18 39,95 г/мольБлагородний газ
| 40Ar | 22 | 39,9624 | -35 039,9 | 99,6035% | Стабільний | 0+ | --- | 1920 |
| 36Ar | 18 | 35,9675 | -30 231,542 | 0,3336% | Стабільний | 0+ | β⁺ | 1920 |
| 38Ar | 20 | 37,9627 | -34 714,83 | 0,0629% | Стабільний | 0+ | --- | 1934 |
| 29Ar | 11 | 29,0408 | 37 970,0 | --- | --- | (5/2+) | p→27S(100%) | 2018 |
| 30Ar | 12 | 30,0237 | 22 070,0 | --- | --- | 0+ | p→28S(100%) | 2015 |
| 31Ar | 13 | 31,0122 | 11 330,0 | --- | 15,0 мс | 5/2+ | β⁺p→30S(68,3%) β⁺→31Cl(22,63%) β⁺p→29P(9%) β⁺pα(<0,38%) β⁺p(0,07%) β⁺α→27P(<0,03%) p→29S(<0,001%) | 1986 |
| 32Ar | 14 | 31,9976 | -2 200,4 | --- | 98,0 мс | 0+ | β⁺→32Cl(64,42%) β⁺p→31S(35,58%) | 1977 |
| 33Ar | 15 | 32,9899 | -9 384,3 | --- | 173,0 мс | 1/2+ | β⁺→33Cl(61,3%) β⁺p→32S(38,7%) | 1964 |
| 34Ar | 16 | 33,9803 | -18 378,29 | --- | 846,46 мс | 0+ | β⁺→34Cl(100%) | 1966 |
| 35Ar | 17 | 34,9753 | -23 047,3 | --- | 1,78 с | 3/2+ | β⁺→35Cl(100%) | 1940 |
| 37Ar | 19 | 36,9668 | -30 947,68 | --- | 35,01 д | 3/2+ | EC→37Cl(100%) | 1941 |
| 39Ar | 21 | 38,9643 | -33 242,0 | --- | 268,0 р | 7/2- | β⁻→39K(100%) | 1950 |
| 41Ar | 23 | 40,9645 | -33 067,5 | --- | 1,83 год | 7/2- | β⁻→41K(100%) | 1936 |
| 42Ar | 24 | 41,963 | -34 423,0 | --- | 32,9 р | 0+ | β⁻→42K(100%) | 1952 |
| 43Ar | 25 | 42,9656 | -32 010,0 | --- | 5,37 хв | (5/2-) | β⁻→43K(100%) | 1969 |
| 44Ar | 26 | 43,9649 | -32 673,3 | --- | 11,87 хв | 0+ | β⁻→44K(100%) | 1969 |
| 45Ar | 27 | 44,968 | -29 770,8 | --- | 21,48 с | (5/2-) | β⁻→45K(100%) | 1974 |
| 46Ar | 28 | 45,968 | -29 771,3 | --- | 8,4 с | 0+ | β⁻→46K(100%) | 1974 |
| 47Ar | 29 | 46,9728 | -25 367,3 | --- | 1,23 с | (3/2-) | β⁻→47K(~100%) β⁻n→46K(<0,2%) | 1985 |
| 48Ar | 30 | 47,976 | -22 355,0 | --- | 415,0 мс | 0+ | β⁻→48K(62%) β⁻n→47K(38%) | 2004 |
| 49Ar | 31 | 48,9817 | -17 060,0 | --- | 236,0 мс | (3/2-) | β⁻→49K(71%) β⁻n→48K(29%) β⁻n→47K | 1989 |
| 50Ar | 32 | 49,9858 | -13 230,0 | --- | 106,0 мс | 0+ | β⁻→50K(63%) β⁻n→49K(37%) β⁻n→48K | 1989 |
| 51Ar | 33 | 50,993 | -6 490,0 | --- | 30,0 мс | (1/2-) | β⁻→51K β⁻n→50K β⁻n→49K | 1989 |
| 52Ar | 34 | 51,9985 | -1 380,0 | --- | 40,0 мс | 0+ | β⁻→52K β⁻n→51K β⁻n→50K | 2009 |
| 53Ar | 35 | 53,0073 | 6 790,0 | --- | 20,0 мс | (5/2-) | β⁻→53K β⁻n→52K β⁻n→51K | 2009 |
| 54Ar | 36 | 54,0135 | 12 560,0 | --- | 5,0 мс | 0+ | β⁻→54K β⁻n→53K β⁻n→52K | 2018 |