Se
Селен
Z 34 78,971 г/мольІнший неметал
| 80Se | 46 | 79,9165 | -77 759,5 | 49,8% | Стабільний | 0+ | β⁻ | 1922 |
| 78Se | 44 | 77,9173 | -77 025,95 | 23,69% | Стабільний | 0+ | --- | 1922 |
| 76Se | 42 | 75,9192 | -75 251,959 | 9,23% | Стабільний | 0+ | --- | 1922 |
| 82Se | 48 | 81,9167 | -77 593,9 | 8,82% | 87,6 Ер | 0+ | β⁻(100%) | 1922 |
| 77Se | 43 | 76,9199 | -74 599,5 | 7,6% | Стабільний | 1/2- | --- | 1922 |
| 74Se | 40 | 73,9225 | -72 213,21 | 0,86% | Стабільний | 0+ | β⁺ | 1922 |
| 63Se | 29 | 62,9819 | -16 850,0 | --- | 13,2 мс | (3/2-) | β⁺p→62Ge(89%) β⁺→63As(11%) p→61Ge(<0,5%) | 2016 |
| 64Se | 30 | 63,9712 | -26 860,0 | --- | 22,6 мс | 0+ | β⁺→64As β⁺p→63Ge | 2005 |
| 65Se | 31 | 64,9646 | -33 020,0 | --- | 34,2 мс | (3/2-) | β⁺p→64Ge(87%) β⁺→65As(13%) | 1993 |
| 66Se | 32 | 65,9553 | -41 660,0 | --- | 54,0 мс | 0+ | β⁺→66As(100%) β⁺p→65Ge | 1993 |
| 67Se | 33 | 66,95 | -46 580,0 | --- | 133,0 мс | (5/2-) | β⁺→67As(99,5%) β⁺p→66Ge(0,5%) | 1991 |
| 68Se | 34 | 67,9418 | -54 189,4 | --- | 35,5 с | 0+ | β⁺→68As(100%) | 1990 |
| 69Se | 35 | 68,9394 | -56 434,7 | --- | 27,4 с | 1/2- | β⁺→69As(99,948%) β⁺p→68Ge(0,052%) | 1974 |
| 69mSe | 35 | 68,9395 | -56 395,9 | --- | 2,0 мкс | 5/2- | γ→69Se(100%) | 1988 |
| 69nSe | 35 | 68,94 | -55 860,7 | --- | 955,0 нс | 9/2+ | γ→69Se(100%) | 1988 |
| 70Se | 36 | 69,9335 | -61 929,9 | --- | 41,1 хв | 0+ | β⁺→70As(100%) | 1950 |
| 71Se | 37 | 70,9322 | -63 146,5 | --- | 4,74 хв | (5/2-) | β⁺→71As(100%) | 1957 |
| 71mSe | 37 | 70,9323 | -63 097,7 | --- | 5,6 мкс | (1/2-) | γ→71Se(100%) | 1982 |
| 71nSe | 37 | 70,9325 | -62 886,0 | --- | 19,0 мкс | (9/2+) | γ→71Se(100%) | 1982 |
| 72Se | 38 | 71,9271 | -67 868,2 | --- | 8,4 д | 0+ | EC→72As(100%) | 1948 |
| 73Se | 39 | 72,9268 | -68 227,0 | --- | 7,15 год | 9/2+ | β⁺→73As(100%) | 1948 |
| 73mSe | 39 | 72,9268 | -68 201,0 | --- | 39,8 хв | 3/2- | γ→73Se(72,6%) β⁺→73As(27,4%) | 1960 |
| 75Se | 41 | 74,9225 | -72 169,49 | --- | 119,78 д | 5/2+ | EC→75As(100%) | 1947 |
| 77mSe | 43 | 76,9201 | -74 437,58 | --- | 17,36 с | 7/2+ | γ→77Se(100%) | 1947 |
| 79Se | 45 | 78,9185 | -75 917,47 | --- | 327,0 кр | 7/2+ | β⁻→79Br(100%) | 1950 |
| 79mSe | 45 | 78,9186 | -75 821,7 | --- | 3,9 хв | 1/2- | γ→79Se(~100%) β⁻→79Br(0,056%) | 1950 |
| 81Se | 47 | 80,918 | -76 389,0 | --- | 18,45 хв | 1/2- | β⁻→81Br(100%) | 1948 |
| 81mSe | 47 | 80,9181 | -76 286,0 | --- | 57,28 хв | 7/2+ | γ→81Se(~100%) β⁻→81Br(0,051%) | 1971 |
| 83Se | 49 | 82,9191 | -75 341,0 | --- | 22,25 хв | 9/2+ | β⁻→83Br(100%) | 1937 |
| 83mSe | 49 | 82,9194 | -75 112,0 | --- | 1,17 хв | 1/2- | β⁻→83Br(100%) | 1969 |
| 84Se | 50 | 83,9185 | -75 947,7 | --- | 3,26 хв | 0+ | β⁻→84Br(100%) | 1960 |
| 85Se | 51 | 84,9223 | -72 413,6 | --- | 32,9 с | (5/2+) | β⁻→85Br(100%) | 1960 |
| 86Se | 52 | 85,9243 | -70 503,2 | --- | 14,3 с | 0+ | β⁻→86Br(100%) β⁻n→85Br | 1973 |
| 87Se | 53 | 86,9287 | -66 426,1 | --- | 5,5 с | (3/2+) | β⁻→87Br(99,4%) β⁻n→86Br(0,6%) | 1968 |
| 88Se | 54 | 87,9314 | -63 884,0 | --- | 1,53 с | 0+ | β⁻→88Br(99,01%) β⁻n→87Br(0,99%) | 1970 |
| 89Se | 55 | 88,9367 | -58 992,0 | --- | 430,0 мс | (5/2+) | β⁻→89Br(92,2%) β⁻n→88Br(7,8%) | 1971 |
| 90Se | 56 | 89,9401 | -55 800,0 | --- | 210,0 мс | 0+ | β⁻→90Br(100%) β⁻n→89Br | 1994 |
| 91Se | 57 | 90,9457 | -50 580,0 | --- | 270,0 мс | (1/2+) | β⁻→91Br(79%) β⁻n→90Br(21%) β⁻n→89Br | 1975 |
| 92Se | 58 | 91,9498 | -46 720,0 | --- | 90,0 мс | 0+ | β⁻→92Br β⁻n→91Br β⁻n→90Br | 1997 |
| 92mSe | 58 | 91,9519 | -44 780,0 | --- | 15,7 мкс | (9-) | γ→92Se(100%) | 2012 |
| 93Se | 59 | 92,9561 | -40 860,0 | --- | 130,0 мс | (1/2+) | β⁻→93Br β⁻n→92Br β⁻n→91Br | 1997 |
| 93mSe | 59 | 92,9569 | -40 180,0 | --- | 420,0 нс | --- | γ→93Se(100%) | 2012 |
| 94Se | 60 | 93,9605 | -36 800,0 | --- | 50,0 мс | 0+ | β⁻→94Br β⁻n→93Br β⁻n→92Br | 1997 |
| 94mSe | 60 | 93,9631 | -34 370,0 | --- | 680,0 нс | (7-) | γ→94Se(100%) | 2020 |
| 95Se | 61 | 94,9673 | -30 460,0 | --- | 70,0 мс | (3/2+) | β⁻→95Br β⁻n→94Br β⁻n→93Br | 2010 |