Ba
Barium
Z 56 137.327 g/molAlkaline Earth Metal
| 138Ba | 82 | 137.9052 | -88,261.81 | 71.7% | Stable | 0+ | --- | 1925 |
| 137Ba | 81 | 136.9058 | -87,721.4 | 11.23% | Stable | 3/2+ | --- | 1932 |
| 136Ba | 80 | 135.9046 | -88,887.08 | 7.85% | Stable | 0+ | --- | 1932 |
| 135Ba | 79 | 134.9057 | -87,850.65 | 6.59% | Stable | 3/2+ | --- | 1932 |
| 134Ba | 78 | 133.9045 | -88,950.0 | 2.42% | Stable | 0+ | --- | 1936 |
| 130Ba | 74 | 129.9063 | -87,256.78 | 0.11% | Stable | 0+ | β⁺ | 1936 |
| 132Ba | 76 | 131.9051 | -88,434.9 | 0.1% | Stable | 0+ | β⁺ | 1936 |
| 113Ba | 57 | 112.9574 | -39,710.0 | --- | 30.0 ms | (5/2+) | p→112Cs α→109Xe | --- |
| 114Ba | 58 | 113.9507 | -45,910.0 | --- | 460.0 ms | 0+ | β⁺→114Cs(80%) β⁺p→113Xe(20%) α→110Xe(0.9%) CD→102Sn(<0.003%) | 1995 |
| 115Ba | 59 | 114.9475 | -48,920.0 | --- | 450.0 ms | (5/2+) | β⁺→115Cs(100%) β⁺p→114Xe(>15%) | 1997 |
| 116Ba | 60 | 115.9416 | -54,380.0 | --- | 1.3 s | 0+ | β⁺→116Cs(97%) β⁺p→115Xe(3%) | 1997 |
| 117Ba | 61 | 116.9383 | -57,460.0 | --- | 1.75 s | (3/2+) | β⁺→117Cs(86.976%) β⁺p→116Xe(13%) β⁺α→113I(0.024%) | 1977 |
| 118Ba | 62 | 117.9332 | -62,200.0 | --- | 5.2 s | 0+ | β⁺→118Cs(100%) | 1997 |
| 119Ba | 63 | 118.9307 | -64,590.0 | --- | 5.4 s | (5/2+) | β⁺→119Cs(75%) β⁺p→118Xe(25%) | 1974 |
| 120Ba | 64 | 119.926 | -68,890.0 | --- | 24.0 s | 0+ | β⁺→120Cs(100%) | 1974 |
| 121Ba | 65 | 120.9241 | -70,740.0 | --- | 29.7 s | 5/2+ | β⁺→121Cs(99.98%) β⁺p→120Xe(0.02%) | 1975 |
| 122Ba | 66 | 121.9199 | -74,609.0 | --- | 1.95 m | 0+ | β⁺→122Cs(100%) | 1974 |
| 123Ba | 67 | 122.9188 | -75,655.0 | --- | 2.7 m | 5/2+ | β⁺→123Cs(100%) | 1962 |
| 123mBa | 67 | 122.9189 | -75,534.0 | --- | 830.0 ns | (1/2+) | γ→123Ba(100%) | 1991 |
| 124Ba | 68 | 123.9151 | -79,090.0 | --- | 11.0 m | 0+ | β⁺→124Cs(100%) | 1967 |
| 125Ba | 69 | 124.9145 | -79,669.0 | --- | 3.3 m | 1/2+ | β⁺→125Cs(100%) | 1968 |
| 125mBa | 69 | 124.9146 | -79,549.0 | --- | 2.76 µs | (7/2-) | γ→125Ba(100%) | 1989 |
| 126Ba | 70 | 125.9113 | -82,670.0 | --- | 1.67 h | 0+ | β⁺→126Cs(100%) | 1954 |
| 127Ba | 71 | 126.9111 | -82,818.0 | --- | 12.7 m | 1/2+ | β⁺→127Cs(100%) | 1952 |
| 127mBa | 71 | 126.9112 | -82,738.0 | --- | 1.93 s | 7/2- | γ→127Ba(100%) | 1992 |
| 128Ba | 72 | 127.9084 | -85,369.2 | --- | 2.43 d | 0+ | EC→128Cs(100%) | 1950 |
| 129Ba | 73 | 128.9087 | -85,061.0 | --- | 2.23 h | 1/2+ | β⁺→129Cs(100%) | 1950 |
| 129mBa | 73 | 128.9087 | -85,053.0 | --- | 2.13 h | 7/2+ | β⁺→129Cs(100%) γ→129Ba | 1950 |
| 130mBa | 74 | 129.909 | -84,781.7 | --- | 9.54 ms | 8- | γ→130Ba(100%) | 1969 |
| 131Ba | 75 | 130.9069 | -86,679.0 | --- | 11.52 d | 1/2+ | β⁺→131Cs(100%) | 1947 |
| 131mBa | 75 | 130.9071 | -86,491.0 | --- | 14.26 m | 9/2- | γ→131Ba(100%) | 1963 |
| 133Ba | 77 | 132.906 | -87,553.5 | --- | 10.54 y | 1/2+ | EC→133Cs(100%) | 1941 |
| 133mBa | 77 | 132.9063 | -87,265.2 | --- | 1.62 d | 11/2- | γ→133Ba(99.99%) EC→133Cs(0.01%) | 1941 |
| 134mBa | 78 | 133.9077 | -85,992.8 | --- | 2.61 µs | 10+ | γ→134Ba(100%) | 1982 |
| 135mBa | 79 | 134.906 | -87,582.43 | --- | 1.17 d | 11/2- | γ→135Ba(100%) | 1948 |
| 135nBa | 79 | 134.9083 | -85,462.7 | --- | 1.06 ms | (23/2+) | γ→135Ba(100%) | 2018 |
| 136mBa | 80 | 135.9068 | -86,856.55 | --- | 308.4 ms | 7- | γ→136Ba(100%) | 1965 |
| 136nBa | 80 | 135.9082 | -85,529.9 | --- | 91.0 ns | 10+ | γ→136Ba(100%) | 2004 |
| 137mBa | 81 | 136.9065 | -87,059.74 | --- | 2.55 m | 11/2- | γ→137Ba(100%) | 1965 |
| 137nBa | 81 | 136.9083 | -85,372.3 | --- | 589.0 ns | (19/2-) | γ→137Ba(100%) | 1973 |
| 138mBa | 82 | 137.9075 | -86,171.27 | --- | 850.0 ns | 6+ | γ→138Ba(100%) | 1971 |
| 139Ba | 83 | 138.9088 | -84,913.92 | --- | 1.38 h | 7/2- | β⁻→139La(100%) | 1937 |
| 140Ba | 84 | 139.9106 | -83,268.0 | --- | 12.75 d | 0+ | β⁻→140La(100%) | 1939 |
| 141Ba | 85 | 140.9144 | -79,732.0 | --- | 18.27 m | 3/2- | β⁻→141La(100%) | 1945 |
| 142Ba | 86 | 141.9164 | -77,842.0 | --- | 10.6 m | 0+ | β⁻→142La(100%) | 1959 |
| 143Ba | 87 | 142.9206 | -73,937.0 | --- | 14.5 s | 5/2- | β⁻→143La(100%) | 1962 |
| 144Ba | 88 | 143.923 | -71,767.0 | --- | 11.73 s | 0+ | β⁻→144La(100%) | 1967 |
| 145Ba | 89 | 144.9275 | -67,516.0 | --- | 4.31 s | 5/2- | β⁻→145La(100%) | 1974 |
| 146Ba | 90 | 145.9304 | -64,866.3 | --- | 2.15 s | 0+ | β⁻→146La(100%) | 1970 |
| 147Ba | 91 | 146.9353 | -60,264.0 | --- | 893.0 ms | 5/2- | β⁻→147La(99.93%) β⁻n→146La(0.07%) | 1978 |
| 148Ba | 92 | 147.9382 | -57,544.9 | --- | 620.0 ms | 0+ | β⁻→148La(99.6%) β⁻n→147La(0.4%) | 1979 |
| 149Ba | 93 | 148.9433 | -52,830.6 | --- | 349.0 ms | (3/2-) | β⁻→149La(96.1%) β⁻n→148La(3.9%) | 1993 |
| 150Ba | 94 | 149.9464 | -49,890.0 | --- | 258.0 ms | 0+ | β⁻→150La(99%) β⁻n→149La(1%) | 1994 |
| 151Ba | 95 | 150.9518 | -44,940.0 | --- | 167.0 ms | (3/2-) | β⁻→151La(100%) β⁻n→150La | 1994 |
| 152Ba | 96 | 151.9553 | -41,610.0 | --- | 139.0 ms | 0+ | β⁻→152La(100%) β⁻n→151La | 2010 |
| 153Ba | 97 | 152.9608 | -36,470.0 | --- | 113.0 ms | (5/2-) | β⁻→153La(100%) β⁻n→152La β⁻n→151La | 2016 |
| 154Ba | 98 | 153.9647 | -32,920.0 | --- | 53.0 ms | 0+ | β⁻→154La(100%) | 2017 |