Kr
Krypton
Z 36 83.798 g/molNoble Gas
| 84Kr | 48 | 83.9115 | -82,439.345 | 56.987% | Stable | 0+ | --- | 1920 |
| 86Kr | 50 | 85.9106 | -83,265.676 | 17.279% | Stable | 0+ | β⁻ | 1920 |
| 82Kr | 46 | 81.9135 | -80,591.795 | 11.593% | Stable | 0+ | --- | 1920 |
| 83Kr | 47 | 82.9141 | -79,990.643 | 11.5% | Stable | 9/2+ | --- | 1920 |
| 80Kr | 44 | 79.9164 | -77,893.5 | 2.286% | Stable | 0+ | --- | 1920 |
| 78Kr | 42 | 77.9204 | -74,178.3 | 0.355% | Stable | 0+ | β⁺ | 1920 |
| 67Kr | 31 | 66.9833 | -15,550.0 | --- | 7.4 ms | (3/2-) | p→65Se(37%) β⁺→67Br | 2016 |
| 68Kr | 32 | 67.9725 | -25,630.0 | --- | 21.6 ms | 0+ | β⁺p→67Se(90%) β⁺→68Br p→67Br | 2016 |
| 69Kr | 33 | 68.9655 | -32,140.0 | --- | 27.9 ms | (5/2-) | β⁺p→68Se(94%) β⁺→69Br(6%) | 1995 |
| 70Kr | 34 | 69.9559 | -41,100.0 | --- | 45.0 ms | 0+ | β⁺→70Br(100%) β⁺p→69Se(<1.3%) | 1995 |
| 71Kr | 35 | 70.9503 | -46,330.0 | --- | 98.8 ms | (5/2-) | β⁺→71Br(97.9%) β⁺p→70Se(2.1%) | 1981 |
| 72Kr | 36 | 71.9421 | -53,941.0 | --- | 17.16 s | 0+ | β⁺→72Br(100%) | 1973 |
| 73Kr | 37 | 72.9393 | -56,552.0 | --- | 27.3 s | (3/2-) | β⁺→73Br(99.75%) β⁺p→72Se(0.25%) | 1972 |
| 73mKr | 37 | 72.9398 | -56,118.0 | --- | 107.0 ns | (9/2+) | γ→73Kr(100%) | 1993 |
| 74Kr | 38 | 73.9331 | -62,331.8 | --- | 11.5 m | 0+ | β⁺→74Br(100%) | 1960 |
| 75Kr | 39 | 74.9309 | -64,324.0 | --- | 4.6 m | 5/2+ | β⁺→75Br(100%) | 1960 |
| 76Kr | 40 | 75.9259 | -69,014.0 | --- | 14.8 h | 0+ | β⁺→76Br(100%) | 1954 |
| 77Kr | 41 | 76.9247 | -70,169.5 | --- | 1.21 h | 5/2+ | β⁺→77Br(100%) | 1948 |
| 77mKr | 41 | 76.9247 | -70,103.0 | --- | 118.0 ns | 3/2- | γ→77Kr(100%) | 1975 |
| 79Kr | 43 | 78.9201 | -74,442.0 | --- | 1.46 d | 1/2- | β⁺→79Br(100%) | 1948 |
| 79mKr | 43 | 78.9202 | -74,312.0 | --- | 50.0 s | 7/2+ | γ→79Kr(100%) | 1940 |
| 81Kr | 45 | 80.9166 | -77,696.2 | --- | 229.0 ky | 7/2+ | EC→81Br(100%) | 1950 |
| 81mKr | 45 | 80.9168 | -77,505.6 | --- | 13.1 s | 1/2- | γ→81Kr(~100%) EC→81Br(0.003%) | 1940 |
| 83mKr | 47 | 82.9141 | -79,981.238 | --- | 156.8 ns | 7/2+ | γ→83Kr(100%) | 1963 |
| 83nKr | 47 | 82.9142 | -79,949.086 | --- | 1.83 h | 1/2- | γ→83Kr(100%) | 1971 |
| 84mKr | 48 | 83.915 | -79,203.27 | --- | 1.83 µs | 8+ | γ→84Kr(100%) | 1982 |
| 85Kr | 49 | 84.9125 | -81,480.3 | --- | 10.73 y | 9/2+ | β⁻→85Rb(100%) | 1940 |
| 85mKr | 49 | 84.9129 | -81,175.4 | --- | 4.48 h | 1/2- | β⁻→85Rb(78.8%) γ→85Kr(21.2%) | 1937 |
| 85nKr | 49 | 84.9147 | -79,488.5 | --- | 1.82 µs | (17/2+) | γ→85Kr(100%) | 1989 |
| 87Kr | 51 | 86.9134 | -80,709.53 | --- | 1.27 h | 5/2+ | β⁻→87Rb(100%) | 1940 |
| 88Kr | 52 | 87.9144 | -79,691.3 | --- | 2.83 h | 0+ | β⁻→88Rb(100%) | 1939 |
| 89Kr | 53 | 88.9178 | -76,535.8 | --- | 3.15 m | 3/2+ | β⁻→89Rb(100%) | 1940 |
| 90Kr | 54 | 89.9195 | -74,959.3 | --- | 32.32 s | 0+ | β⁻→90Rb(100%) | 1951 |
| 91Kr | 55 | 90.9238 | -70,974.0 | --- | 8.57 s | 5/2+ | β⁻→91Rb(100%) β⁻n→90Rb | 1951 |
| 92Kr | 56 | 91.9262 | -68,769.3 | --- | 1.84 s | 0+ | β⁻→92Rb(99.967%) β⁻n→91Rb(0.033%) | 1951 |
| 93Kr | 57 | 92.9311 | -64,136.0 | --- | 1.29 s | 1/2+ | β⁻→93Rb(98.05%) β⁻n→92Rb(1.95%) | 1951 |
| 94Kr | 58 | 93.9341 | -61,348.0 | --- | 212.0 ms | 0+ | β⁻→94Rb(98.89%) β⁻n→93Rb(1.11%) | 1972 |
| 95Kr | 59 | 94.9397 | -56,159.0 | --- | 114.0 ms | 1/2+ | β⁻→95Rb(97.13%) β⁻n→94Rb(2.87%) β⁻n→93Rb | 1994 |
| 95mKr | 59 | 94.9399 | -55,964.0 | --- | 1.58 µs | (7/2+) | γ→95Kr(100%) | 2006 |
| 96Kr | 60 | 95.943 | -53,082.0 | --- | 80.0 ms | 0+ | β⁻→96Rb(96.3%) β⁻n→95Rb(3.7%) | 1994 |
| 97Kr | 61 | 96.9491 | -47,420.0 | --- | 62.2 ms | (3/2+) | β⁻→97Rb(93.3%) β⁻n→96Rb(6.7%) β⁻n→95Rb | 1997 |
| 98Kr | 62 | 97.9526 | -44,120.0 | --- | 42.8 ms | 0+ | β⁻→98Rb(93%) β⁻n→97Rb(7%) β⁻n→96Rb | 1997 |
| 99Kr | 63 | 98.9588 | -38,400.0 | --- | 40.0 ms | (5/2-) | β⁻→99Rb(89%) β⁻n→98Rb(11%) β⁻n→97Rb | 1997 |
| 100Kr | 64 | 99.963 | -34,470.0 | --- | 12.0 ms | 0+ | β⁻→100Rb(100%) β⁻n→99Rb β⁻n→98Rb | 1997 |
| 101Kr | 65 | 100.9693 | -28,580.0 | --- | 9.0 ms | (5/2+) | β⁻→101Rb β⁻n→100Rb β⁻n→99Rb | 2010 |