Pr
Praseodymium
Z 59 140.908 g/molLanthanide
| 141Pr | 82 | 140.9077 | -86,014.5 | 100.0% | Stable | 5/2+ | --- | 1924 |
| 121Pr | 62 | 120.9554 | -41,550.0 | --- | 12.0 ms | (3/2+) | p→120Ce(100%) | 2005 |
| 122Pr | 63 | 121.9519 | -44,780.0 | --- | 500.0 ms | --- | β⁺→122Ce β⁺p→121La | --- |
| 123Pr | 64 | 122.9461 | -50,230.0 | --- | 800.0 ms | (3/2+) | β⁺→123Ce β⁺p→122La | --- |
| 124Pr | 65 | 123.9429 | -53,150.0 | --- | 1.2 s | --- | β⁺→124Ce(100%) β⁺p→123La | 1986 |
| 125Pr | 66 | 124.9377 | -58,070.0 | --- | 3.3 s | (3/2+) | β⁺→125Ce(100%) β⁺p→124La | 2002 |
| 126Pr | 67 | 125.9352 | -60,320.0 | --- | 3.12 s | (4) | β⁺→126Ce(100%) β⁺p→125La | 1983 |
| 127Pr | 68 | 126.9307 | -64,540.0 | --- | 4.2 s | (3/2+) | β⁺→127Ce(100%) | 1995 |
| 127mPr | 68 | 126.9314 | -63,940.0 | --- | 2.0 µs | (11/2-) | γ→127Pr | 1998 |
| 128Pr | 69 | 127.9288 | -66,331.0 | --- | 2.85 s | (3+) | β⁺→128Ce(100%) β⁺p→127La | 1985 |
| 129Pr | 70 | 128.9251 | -69,774.0 | --- | 30.0 s | (3/2+) | β⁺→129Ce(100%) | 1977 |
| 129mPr | 70 | 128.9255 | -69,390.0 | --- | 26.0 µs | (11/2-) | γ→129Pr(100%) | 1997 |
| 130Pr | 71 | 129.9236 | -71,180.0 | --- | 40.0 s | (6+) | β⁺→130Ce(100%) | 1977 |
| 130mPr | 71 | 129.9237 | -71,080.0 | --- | 10.0 s | (2+) | β⁺→130Ce | 1988 |
| 131Pr | 72 | 130.9202 | -74,300.0 | --- | 1.5 m | (3/2+) | β⁺→131Ce(100%) | 1977 |
| 131mPr | 72 | 130.9204 | -74,150.0 | --- | 5.73 s | (11/2-) | γ→131Pr(96.4%) β⁺→131Ce(3.6%) | 1996 |
| 132Pr | 73 | 131.9192 | -75,227.0 | --- | 1.49 m | (2+) | β⁺→132Ce(100%) | 1974 |
| 132mPr | 73 | 131.9193 | -75,200.0 | --- | 1.0 s | (5+) | β⁺→132Ce γ→132Pr | 1990 |
| 132nPr | 73 | 131.9195 | -74,980.0 | --- | 2.46 µs | (8+) | γ→132Pr(100%) | 2012 |
| 133Pr | 74 | 132.9163 | -77,938.0 | --- | 6.5 m | 5/2+ | β⁺→133Ce(100%) | 1970 |
| 133mPr | 74 | 132.9165 | -77,746.0 | --- | 1.1 s | (11/2-) | γ→133Pr(100%) | 1995 |
| 134Pr | 75 | 133.9157 | -78,528.0 | --- | 17.0 m | 2- | β⁺→134Ce(100%) | 1967 |
| 134mPr | 75 | 133.9158 | -78,460.0 | --- | --- | 6- | β⁺→134Ce(100%) | 1973 |
| 135Pr | 76 | 134.9131 | -80,936.0 | --- | 24.0 m | 3/2+ | β⁺→135Ce(100%) | 1954 |
| 135mPr | 76 | 134.9135 | -80,578.0 | --- | 105.0 µs | (11/2-) | γ→135Pr(100%) | 1973 |
| 136Pr | 77 | 135.9127 | -81,340.0 | --- | 13.1 m | 2+ | β⁺→136Ce(100%) | 1968 |
| 137Pr | 78 | 136.9107 | -83,202.0 | --- | 1.28 h | 5/2+ | β⁺→137Ce(100%) | 1958 |
| 137mPr | 78 | 136.9113 | -82,641.0 | --- | 2.66 µs | 11/2- | γ→137Pr(100%) | 1987 |
| 138Pr | 79 | 137.9108 | -83,129.0 | --- | 1.45 m | 1+ | β⁺→138Ce(100%) | 1951 |
| 138mPr | 79 | 137.9111 | -82,779.0 | --- | 2.12 h | 7- | β⁺→138Ce(100%) | 1958 |
| 139Pr | 80 | 138.9089 | -84,829.0 | --- | 4.41 h | 5/2+ | β⁺→139Ce(100%) | 1951 |
| 140Pr | 81 | 139.9091 | -84,686.0 | --- | 3.39 m | 1+ | β⁺→140Ce(100%) EC→140Ce(51.3%) β⁺(48.7%) | 1938 |
| 140mPr | 81 | 139.9092 | -84,558.0 | --- | 350.0 ns | 5+ | γ→140Pr(100%) | 1964 |
| 140nPr | 81 | 139.9099 | -83,922.0 | --- | 3.05 µs | (7-) | γ→140Pr(100%) | 1964 |
| 142Pr | 83 | 141.9101 | -83,786.4 | --- | 19.12 h | 2- | β⁻→142Nd(~100%) EC→142Ce(0.016%) | 1935 |
| 142mPr | 83 | 141.9101 | -83,782.7 | --- | 14.6 m | 5- | γ→142Pr(100%) | 1967 |
| 143Pr | 84 | 142.9108 | -83,068.2 | --- | 13.57 d | 7/2+ | β⁻→143Nd(100%) | 1948 |
| 144Pr | 85 | 143.9133 | -80,750.6 | --- | 17.28 m | 0- | β⁻→144Nd(100%) | 1951 |
| 144mPr | 85 | 143.9134 | -80,691.6 | --- | 7.2 m | 3- | γ→144Pr(~100%) β⁻→144Nd(0.07%) | 1970 |
| 145Pr | 86 | 144.9145 | -79,626.0 | --- | 5.98 h | 7/2+ | β⁻→145Nd(100%) | 1954 |
| 146Pr | 87 | 145.9177 | -76,670.0 | --- | 24.09 m | (2-) | β⁻→146Nd(100%) | 1953 |
| 147Pr | 88 | 146.919 | -75,444.0 | --- | 13.39 m | 3/2+ | β⁻→147Nd(100%) | 1964 |
| 148Pr | 89 | 147.9221 | -72,535.0 | --- | 2.29 m | 1- | β⁻→148Nd(100%) | 1964 |
| 148mPr | 89 | 147.9222 | -72,458.0 | --- | 2.01 m | (4) | β⁻→148Nd(64%) γ→148Pr(36%) | 1964 |
| 149Pr | 90 | 148.9237 | -71,039.0 | --- | 2.26 m | (5/2+) | β⁻→149Nd(100%) | 1964 |
| 150Pr | 91 | 149.9267 | -68,301.0 | --- | 6.19 s | 1- | β⁻→150Nd(100%) | 1970 |
| 151Pr | 92 | 150.9283 | -66,780.0 | --- | 18.9 s | (3/2-) | β⁻→151Nd(100%) | 1990 |
| 151mPr | 92 | 150.9283 | -66,745.0 | --- | 50.0 µs | (7/2+) | γ→151Pr(100%) | 2006 |
| 152Pr | 93 | 151.9316 | -63,758.0 | --- | 3.57 s | 4+ | β⁻→152Nd(100%) | 1983 |
| 152mPr | 93 | 151.9317 | -63,643.0 | --- | 4.16 µs | (1+) | γ→152Pr(100%) | 1990 |
| 153Pr | 94 | 152.9339 | -61,568.0 | --- | 4.28 s | (3/2-) | β⁻→153Nd(100%) β⁻n→152Nd | 1987 |
| 154Pr | 95 | 153.9379 | -57,860.0 | --- | 2.3 s | (3+) | β⁻→154Nd(100%) β⁻n→153Nd | 1988 |
| 155Pr | 96 | 154.9405 | -55,415.0 | --- | 1.47 s | (3/2-) | β⁻→155Nd(100%) β⁻n→154Nd | 1992 |
| 156Pr | 97 | 155.9448 | -51,449.3 | --- | 444.0 ms | (1+) | β⁻→156Nd(100%) β⁻n→155Nd | 1992 |
| 157Pr | 98 | 156.948 | -48,435.0 | --- | 307.0 ms | (3/2-) | β⁻→157Nd(100%) β⁻n→156Nd | 2017 |
| 158Pr | 99 | 157.9526 | -44,150.0 | --- | 181.0 ms | (5-) | β⁻→158Nd(100%) β⁻n→157Nd | 2016 |
| 159Pr | 100 | 158.9562 | -40,770.0 | --- | 134.0 ms | (3/2-) | β⁻→159Nd(100%) β⁻n→158Nd | 2017 |
| 160Pr | 101 | 159.9611 | -36,200.0 | --- | 170.0 ms | (1+) | β⁻→160Nd(100%) β⁻n→159Nd | 2017 |
| 161Pr | 102 | 160.9651 | -32,490.0 | --- | 90.0 ms | (3/2-) | β⁻→161Nd β⁻n→160Nd | 2018 |