Sr
Strontium
Z 38 87.62 g/molAlkaline Earth Metal
| 88Sr | 50 | 87.9056 | -87,921.629 | 82.58% | Stable | 0+ | --- | 1923 |
| 86Sr | 48 | 85.9093 | -84,523.1 | 9.86% | Stable | 0+ | --- | 1931 |
| 87Sr | 49 | 86.9089 | -84,880.076 | 7.0% | Stable | 9/2+ | --- | 1931 |
| 84Sr | 46 | 83.9134 | -80,649.6 | 0.56% | Stable | 0+ | β⁺ | 1936 |
| 73Sr | 35 | 72.9657 | -31,950.0 | --- | 25.3 ms | (5/2-) | β⁺p→72Kr(63%) β⁺→73Rb(37%) | 1993 |
| 74Sr | 36 | 73.9562 | -40,830.0 | --- | 27.6 ms | 0+ | β⁺→74Rb(100%) β⁺p→73Kr | 1995 |
| 75Sr | 37 | 74.95 | -46,620.0 | --- | 85.2 ms | (3/2-) | β⁺→75Rb(94.8%) β⁺p→74Kr(5.2%) | 1991 |
| 76Sr | 38 | 75.9418 | -54,250.0 | --- | 7.89 s | 0+ | β⁺→76Rb(99.997%) β⁺p→75Kr(0.003%) | 1990 |
| 77Sr | 39 | 76.9379 | -57,803.0 | --- | 9.0 s | 5/2+ | β⁺→77Rb(99.92%) β⁺p→76Kr(0.08%) | 1976 |
| 78Sr | 40 | 77.9322 | -63,174.0 | --- | 2.6 m | 0+ | β⁺→78Rb(100%) | 1982 |
| 79Sr | 41 | 78.9297 | -65,480.0 | --- | 2.25 m | 3/2- | β⁺→79Rb(100%) | 1972 |
| 80Sr | 42 | 79.9245 | -70,311.0 | --- | 1.77 h | 0+ | β⁺→80Rb(100%) | 1961 |
| 81Sr | 43 | 80.9232 | -71,528.0 | --- | 22.3 m | 1/2- | β⁺→81Rb(100%) | 1952 |
| 81mSr | 43 | 80.9233 | -71,449.0 | --- | 390.0 ns | (5/2-) | γ→81Sr(100%) | 1983 |
| 81nSr | 43 | 80.9233 | -71,439.0 | --- | 6.4 µs | (7/2+) | γ→81Sr | 1989 |
| 82Sr | 44 | 81.9184 | -76,010.0 | --- | 25.35 d | 0+ | EC→82Rb(100%) | 1952 |
| 83Sr | 45 | 82.9176 | -76,798.0 | --- | 1.35 d | 7/2+ | β⁺→83Rb(100%) | 1952 |
| 83mSr | 45 | 82.9178 | -76,539.0 | --- | 4.95 s | 1/2- | γ→83Sr(100%) | 1972 |
| 85Sr | 47 | 84.9129 | -81,103.3 | --- | 64.85 d | 9/2+ | EC→85Rb(100%) | 1940 |
| 85mSr | 47 | 84.9132 | -80,864.5 | --- | 1.13 h | 1/2- | γ→85Sr(86.6%) β⁺→85Rb(13.4%) | 1940 |
| 86mSr | 48 | 85.9124 | -81,567.01 | --- | 455.0 ns | 8+ | γ→86Sr(100%) | 1971 |
| 87mSr | 49 | 86.9093 | -84,491.547 | --- | 2.81 h | 1/2- | γ→87Sr(99.7%) EC→87Rb(0.3%) | 1940 |
| 89Sr | 51 | 88.9075 | -86,209.03 | --- | 50.56 d | 5/2+ | β⁻→89Y(100%) | 1937 |
| 90Sr | 52 | 89.9077 | -85,950.9 | --- | 28.91 y | 0+ | β⁻→90Y(100%) | 1948 |
| 91Sr | 53 | 90.9102 | -83,652.0 | --- | 9.65 h | 5/2+ | β⁻→91Y(100%) | 1943 |
| 92Sr | 54 | 91.911 | -82,867.0 | --- | 2.61 h | 0+ | β⁻→92Y(100%) | 1956 |
| 93Sr | 55 | 92.914 | -80,086.0 | --- | 7.43 m | 5/2+ | β⁻→93Y(100%) | 1959 |
| 94Sr | 56 | 93.9154 | -78,845.7 | --- | 1.25 m | 0+ | β⁻→94Y(100%) | 1959 |
| 95Sr | 57 | 94.9194 | -75,117.0 | --- | 23.9 s | 1/2+ | β⁻→95Y(100%) | 1961 |
| 96Sr | 58 | 95.9217 | -72,918.0 | --- | 1.06 s | 0+ | β⁻→96Y(100%) β⁻n→95Y | 1971 |
| 97Sr | 59 | 96.9264 | -68,581.0 | --- | 432.0 ms | 1/2+ | β⁻→97Y(99.98%) β⁻n→96Y(0.02%) | 1978 |
| 97mSr | 59 | 96.9267 | -68,273.0 | --- | 175.2 ns | 7/2+ | γ→97Sr(100%) | 1990 |
| 97nSr | 59 | 96.9273 | -67,750.0 | --- | 513.0 ns | (9/2+) | γ→97Sr(100%) | 1974 |
| 98Sr | 60 | 97.9287 | -66,422.0 | --- | 653.0 ms | 0+ | β⁻→98Y(99.77%) β⁻n→97Y(0.23%) | 1971 |
| 99Sr | 61 | 98.9329 | -62,519.0 | --- | 269.2 ms | 3/2+ | β⁻→99Y(99.9%) β⁻n→98Y(0.1%) | 1975 |
| 100Sr | 62 | 99.9358 | -59,818.0 | --- | 202.1 ms | 0+ | β⁻→100Y(98.89%) β⁻n→99Y(1.11%) | 1978 |
| 100mSr | 62 | 99.9375 | -58,199.0 | --- | 122.0 ns | (4-) | γ→100Sr(100%) | 1995 |
| 101Sr | 63 | 100.9406 | -55,325.0 | --- | 113.7 ms | (5/2-) | β⁻→101Y(97.25%) β⁻n→100Y(2.75%) | 1983 |
| 102Sr | 64 | 101.944 | -52,160.0 | --- | 69.0 ms | 0+ | β⁻→102Y(94.5%) β⁻n→101Y(5.5%) | 1986 |
| 103Sr | 65 | 102.9492 | -47,280.0 | --- | 53.0 ms | (5/2+) | β⁻→103Y(100%) β⁻n→102Y β⁻n→101Y | 1997 |
| 104Sr | 66 | 103.953 | -43,760.0 | --- | 50.6 ms | 0+ | β⁻→104Y(100%) β⁻n→103Y β⁻n→102Y | 1997 |
| 105Sr | 67 | 104.959 | -38,190.0 | --- | 39.0 ms | (5/2+) | β⁻→105Y(100%) β⁻n→104Y β⁻n→103Y | 1997 |
| 106Sr | 68 | 105.9632 | -34,300.0 | --- | 21.0 ms | 0+ | β⁻→106Y(100%) β⁻n→105Y β⁻n→104Y | 2010 |
| 107Sr | 69 | 106.9697 | -28,250.0 | --- | 25.0 ms | (1/2+) | β⁻→107Y β⁻n→106Y β⁻n→105Y | 2010 |