La
Lanthanum
Z 57 138.905 g/molLanthanide
| 139La | 82 | 138.9064 | -87,222.4 | 99.9112% | Stable | 7/2+ | --- | 1924 |
| 138La | 81 | 137.9071 | -86,513.4 | 0.0888% | 103.0 Gy | 5+ | β⁺→138Ba(65.5%) β⁻→138Ce(34.5%) | 1947 |
| 116La | 59 | 115.957 | -40,050.0 | --- | 10.0 ms | --- | β⁺→116Ba β⁺p→115Cs p→115Ba | --- |
| 117La | 60 | 116.9503 | -46,270.0 | --- | 21.7 ms | (3/2+) | p→116Ba(100%) β⁺→117Ba β⁺p→116Cs | 2001 |
| 117mLa | 60 | 117.0 | 0.0 | --- | 10.0 ms | (9/2+) | --- | --- |
| 118La | 61 | 117.9467 | -49,620.0 | --- | 200.0 ms | (1-) | β⁺→118Ba β⁺p→117Cs | --- |
| 119La | 62 | 118.9409 | -55,020.0 | --- | 1.0 s | (11/2-) | β⁺→119Ba | --- |
| 120La | 63 | 119.9382 | -57,570.0 | --- | 2.8 s | (1-) | β⁺→120Ba(100%) β⁺p→119Cs | 1984 |
| 121La | 64 | 120.9332 | -62,190.0 | --- | 5.3 s | (11/2-) | β⁺→121Ba(100%) β⁺p→120Cs | 1988 |
| 122La | 65 | 121.9307 | -64,540.0 | --- | 8.6 s | (1-) | β⁺→122Ba(100%) β⁺p→121Cs | 1984 |
| 123La | 66 | 122.9263 | -68,650.0 | --- | 17.0 s | (11/2-) | β⁺→123Ba(100%) | 1978 |
| 124La | 67 | 123.9246 | -70,260.0 | --- | 29.21 s | (7-) | β⁺→124Ba(100%) | 1978 |
| 124mLa | 67 | 123.9247 | -70,160.0 | --- | 21.0 s | (2-) | β⁺→124Ba(100%) | 1992 |
| 125La | 68 | 124.9208 | -73,759.0 | --- | 1.08 m | (11/2-) | β⁺→125Ba(100%) | 1973 |
| 125mLa | 68 | 124.9209 | -73,652.0 | --- | 390.0 ms | (3/2+) | γ→125La(100%) | 1998 |
| 126La | 69 | 125.9195 | -74,970.0 | --- | 54.0 s | (5-) | β⁺→126Ba(100%) | 1961 |
| 126mLa | 69 | 125.9197 | -74,760.0 | --- | 20.0 s | (1-) | β⁺→126Ba(100%) | 1997 |
| 127La | 70 | 126.9164 | -77,896.0 | --- | 5.1 m | (11/2-) | β⁺→127Ba(100%) | 1963 |
| 127mLa | 70 | 126.9164 | -77,882.0 | --- | 3.7 m | (3/2+) | β⁺→127Ba(100%) | 1963 |
| 128La | 71 | 127.9156 | -78,630.0 | --- | 5.18 m | (5+) | β⁺→128Ba(100%) | 1961 |
| 128mLa | 71 | 127.9157 | -78,530.0 | --- | --- | (1-) | β⁺→128Ba(100%) γ→128La | 1995 |
| 129La | 72 | 128.9127 | -81,324.0 | --- | 11.6 m | (3/2+) | β⁺→129Ba(100%) | 1963 |
| 129mLa | 72 | 128.9129 | -81,152.0 | --- | 560.0 ms | (11/2-) | γ→129La(100%) | 1969 |
| 130La | 73 | 129.9124 | -81,627.0 | --- | 8.7 m | (3+) | β⁺→130Ba(100%) | 1961 |
| 130mLa | 73 | 129.9126 | -81,413.0 | --- | 742.0 ns | (5+) | γ→130La(100%) | 2012 |
| 131La | 74 | 130.9101 | -83,769.0 | --- | 59.0 m | 3/2+ | β⁺→131Ba(100%) | 1951 |
| 131mLa | 74 | 130.9104 | -83,464.0 | --- | 170.0 µs | 11/2- | γ→131La(100%) | 1966 |
| 132La | 75 | 131.9101 | -83,720.0 | --- | 4.59 h | 2- | β⁺→132Ba(100%) | 1951 |
| 132mLa | 75 | 131.9103 | -83,530.0 | --- | 24.3 m | 6- | γ→132La(76%) β⁺→132Ba(24%) | 1969 |
| 133La | 76 | 132.9082 | -85,494.0 | --- | 3.91 h | 5/2+ | β⁺→133Ba(100%) | 1950 |
| 134La | 77 | 133.9085 | -85,219.0 | --- | 6.45 m | 1+ | β⁺→134Ba(100%) | 1951 |
| 134mLa | 77 | 133.909 | -84,780.0 | --- | 29.0 µs | (6-) | γ→134La(100%) | 1985 |
| 135La | 78 | 134.907 | -86,643.0 | --- | 18.91 h | 5/2+ | β⁺→135Ba(100%) | 1948 |
| 136La | 79 | 135.9076 | -86,040.0 | --- | 9.87 m | 1+ | β⁺→136Ba(100%) | 1950 |
| 136mLa | 79 | 135.9079 | -85,780.0 | --- | 114.0 ms | (7-) | γ→136La(100%) | 1966 |
| 136nLa | 79 | 135.9103 | -83,520.0 | --- | 187.0 ns | (14+) | γ→136La(100%) | 2015 |
| 137La | 80 | 136.9065 | -87,140.9 | --- | 60.0 ky | 7/2+ | EC→137Ba(100%) | 1948 |
| 137mLa | 80 | 136.9085 | -85,271.4 | --- | 342.0 ns | 19/2- | γ→137La(100%) | 1982 |
| 138mLa | 81 | 137.9072 | -86,440.8 | --- | 116.0 ns | (3+) | γ→138La(100%) | 1975 |
| 138nLa | 81 | 137.9079 | -85,774.6 | --- | 2.0 µs | 7- | γ→138La(100%) | 2014 |
| 139mLa | 82 | 138.9083 | -85,422.0 | --- | 315.0 ns | (17/2+) | γ→139La(100%) | 2012 |
| 140La | 83 | 139.9095 | -84,312.1 | --- | 1.68 d | 3- | β⁻→140Ce(100%) | 1935 |
| 141La | 84 | 140.911 | -82,930.0 | --- | 3.92 h | (7/2+) | β⁻→141Ce(100%) | 1951 |
| 142La | 85 | 141.9141 | -80,024.0 | --- | 1.52 h | 2- | β⁻→142Ce(100%) | 1953 |
| 142mLa | 85 | 141.9142 | -79,878.0 | --- | 870.0 ns | (4-) | γ→142La(100%) | 1983 |
| 143La | 86 | 142.9161 | -78,171.0 | --- | 14.2 m | (7/2+) | β⁻→143Ce(100%) | 1951 |
| 144La | 87 | 143.9196 | -74,850.0 | --- | 44.0 s | (3-) | β⁻→144Ce(100%) | 1967 |
| 145La | 88 | 144.9218 | -72,835.0 | --- | 24.8 s | (5/2+) | β⁻→145Ce(100%) | 1974 |
| 146La | 89 | 145.9257 | -69,221.2 | --- | 9.9 s | (5-) | β⁻→146Ce(100%) | 1970 |
| 146mLa | 89 | 145.9258 | -69,079.7 | --- | 6.08 s | (1-) | β⁻→146Ce(100%) | 1969 |
| 147La | 90 | 146.9284 | -66,678.0 | --- | 4.03 s | (5/2+) | β⁻→147Ce(99.959%) β⁻n→146Ce(0.041%) | 1979 |
| 148La | 91 | 147.9327 | -62,709.0 | --- | 1.41 s | (2-) | β⁻→148Ce(99.82%) β⁻n→147Ce(0.18%) | 1969 |
| 149La | 92 | 148.9354 | -60,220.0 | --- | 1.07 s | (3/2-) | β⁻→149Ce(98.57%) β⁻n→148Ce(1.43%) | 1979 |
| 150La | 93 | 149.9395 | -56,311.1 | --- | 504.0 ms | (3+) | β⁻→150Ce(97.3%) β⁻n→149Ce(2.7%) | 1993 |
| 151La | 94 | 150.9428 | -53,310.0 | --- | 465.0 ms | (1/2+) | β⁻→151Ce(100%) β⁻n→150Ce | 1994 |
| 152La | 95 | 151.9471 | -49,290.0 | --- | 287.0 ms | (2-) | β⁻→152Ce(100%) β⁻n→151Ce | 1994 |
| 153La | 96 | 152.9506 | -46,060.0 | --- | 245.0 ms | (1/2+) | β⁻→153Ce(100%) β⁻n→152Ce β⁻n→151Ce | 1994 |
| 154La | 97 | 153.9554 | -41,530.0 | --- | 161.0 ms | (2-) | β⁻→154Ce(100%) β⁻n→153Ce β⁻n→152Ce | 2017 |
| 155La | 98 | 154.9593 | -37,930.0 | --- | 101.0 ms | (1/2+) | β⁻→155Ce(100%) β⁻n→154Ce β⁻n→153Ce | 2016 |
| 156La | 99 | 155.9645 | -33,050.0 | --- | 84.0 ms | (4+) | β⁻→156Ce(100%) β⁻n→155Ce | 2017 |
| 157La | 100 | 156.9688 | -29,070.0 | --- | 30.0 ms | (1/2+) | β⁻→157Ce β⁻n→156Ce | 2018 |