Mg
Магній
Z 12 24,305 г/мольЛужноземельний метал
| 24Mg | 12 | 23,985 | -13 933,578 | 78,965% | Стабільний | 0+ | --- | 1920 |
| 26Mg | 14 | 25,9826 | -16 214,544 | 11,025% | Стабільний | 0+ | --- | 1920 |
| 25Mg | 13 | 24,9858 | -13 192,78 | 10,011% | Стабільний | 5/2+ | --- | 1920 |
| 19Mg | 7 | 19,0342 | 31 840,0 | --- | 5,0 пс | (1/2-) | p→17Ne(100%) | 2007 |
| 20Mg | 8 | 20,0188 | 17 477,7 | --- | 90,4 мс | 0+ | β⁺→20Na(69,7%) β⁺p→19Ne(30,3%) | 1974 |
| 21Mg | 9 | 21,0117 | 10 903,9 | --- | 120,0 мс | 5/2+ | β⁺→21Na(79,768%) β⁺p→20Ne(20,1%) β⁺α→17F(0,116%) β⁺pα(0,016%) | 1963 |
| 22Mg | 10 | 21,9996 | -399,99 | --- | 3,87 с | 0+ | β⁺→22Na(100%) | 1961 |
| 23Mg | 11 | 22,9941 | -5 473,67 | --- | 11,3 с | 3/2+ | β⁺→23Na(100%) | 1939 |
| 27Mg | 15 | 26,9843 | -14 586,59 | --- | 9,44 хв | 1/2+ | β⁻→27Al(100%) | 1934 |
| 28Mg | 16 | 27,9839 | -15 019,95 | --- | 20,92 год | 0+ | β⁻→28Al(100%) | 1953 |
| 29Mg | 17 | 28,9886 | -10 612,4 | --- | 1,3 с | 3/2+ | β⁻→29Al(100%) | 1971 |
| 30Mg | 18 | 29,9905 | -8 881,4 | --- | 317,0 мс | 0+ | β⁻→30Al(~100%) β⁻n→29Al(<0,06%) | 1971 |
| 31Mg | 19 | 30,9966 | -3 122,0 | --- | 270,0 мс | 1/2+ | β⁻→31Al(93,8%) β⁻n→30Al(6,2%) | 1977 |
| 32Mg | 20 | 31,9991 | -829,0 | --- | 80,4 мс | 0+ | β⁻→32Al(94,5%) β⁻n→31Al(5,5%) | 1977 |
| 33Mg | 21 | 33,0053 | 4 962,9 | --- | 92,0 мс | 3/2- | β⁻→33Al(86%) β⁻n→32Al(14%) β⁻n→31Al | 1979 |
| 34Mg | 22 | 34,0089 | 8 323,0 | --- | 44,9 мс | 0+ | β⁻→34Al(79%) β⁻n→33Al(21%) β⁻n→32Al(<0,1%) | 1979 |
| 35Mg | 23 | 35,0168 | 15 640,0 | --- | 11,3 мс | (3/2-) | β⁻n→34Al(52%) β⁻→35Al(48%) β⁻n→33Al | 1989 |
| 36Mg | 24 | 36,0219 | 20 380,0 | --- | 3,9 мс | 0+ | β⁻→36Al(52%) β⁻n→35Al(48%) β⁻n→34Al | 1989 |
| 37Mg | 25 | 37,0303 | 28 210,0 | --- | 8,0 мс | (3/2-) | β⁻→37Al β⁻n→36Al β⁻n→35Al | 1996 |
| 38Mg | 26 | 38,0366 | 34 070,0 | --- | 2,0 мс | 0+ | β⁻→38Al(100%) β⁻n→37Al β⁻n→36Al | 1997 |
| 39Mg | 27 | 39,0459 | 42 780,0 | --- | --- | (7/2-) | n→38Mg β⁻→39Al | --- |
| 40Mg | 28 | 40,0532 | 49 550,0 | --- | 1,0 мс | 0+ | β⁻→40Al β⁻n→39Al β⁻n→38Al | 2007 |
| 41Mg | 29 | 41,0624 | 58 100,0 | --- | --- | (3/2-) | β⁻→41Al β⁻n→40Al | --- |