Lr
Lawrencium
Z 103 266.0 g/molActinide Radioactive
| 251Lr | 148 | 251.0943 | 87,830.0 | --- | 300.0 µs | --- | β⁺→251No α→247Md | --- |
| 252Lr | 149 | 252.0951 | 88,540.0 | --- | 369.0 ms | (7-) | α→248Md(98%) SF(2%) β⁺→252No | 2001 |
| 253Lr | 150 | 253.095 | 88,520.0 | --- | 632.0 ms | (7/2-) | α→249Md(90%) SF(1%) β⁺→253No | 1985 |
| 253mLr | 150 | 253.0951 | 88,560.0 | --- | 1.32 s | (1/2-) | α→249Md(90%) SF(12%) β⁺→253No γ→253Lr | 1985 |
| 254Lr | 151 | 254.0962 | 89,650.0 | --- | 12.0 s | (4+) | α→250Md(71.7%) β⁺→254No(28.3%) SF(<0.1%) | 1981 |
| 254mLr | 151 | 254.0964 | 89,750.0 | --- | 20.3 s | (1+) | α→250Md β⁺→254No γ→254Lr | 2019 |
| 255Lr | 152 | 255.0966 | 89,947.0 | --- | 31.1 s | (1/2-) | α→251Md(99.7%) β⁺→255No(0.3%) SF | 1971 |
| 255mLr | 152 | 255.0966 | 89,988.0 | --- | 2.54 s | (7/2-) | α→251Md(40%) γ→255Lr | 2006 |
| 255nLr | 152 | 255.0974 | 90,743.0 | --- | --- | (15/2+) | γ→255Lr(100%) | 2009 |
| 256Lr | 153 | 256.0985 | 91,750.0 | --- | 27.9 s | (0-) | α→252Md(85%) β⁺→256No(15%) SF(<0.03%) | 1965 |
| 257Lr | 154 | 257.0995 | 92,670.0 | --- | 6.0 s | (7/2-) | α→253Md(100%) β⁺→257No SF | 1971 |
| 257mLr | 154 | 257.0996 | 92,770.0 | --- | 270.0 ms | (1/2-) | α→253Md γ→257Lr | 2018 |
| 258Lr | 155 | 258.1018 | 94,780.0 | --- | 3.92 s | --- | α→254Md(97.4%) β⁺→258No(2.6%) | 1971 |
| 259Lr | 156 | 259.1029 | 95,850.0 | --- | 6.2 s | (1/2-) | α→255Md(78%) SF(22%) β⁺→259No | 1971 |
| 260Lr | 157 | 260.1055 | 98,280.0 | --- | 3.0 m | --- | α→256Md(80%) β⁺→260No(20%) | 1971 |
| 261Lr | 158 | 261.1069 | 99,560.0 | --- | 39.0 m | (1/2-) | SF(100%) α→257Md | 1987 |
| 262Lr | 159 | 262.1096 | 102,110.0 | --- | --- | --- | SF(<10%) β⁺→262No α→258Md | 1987 |
| 263Lr | 160 | 263.1113 | 103,670.0 | --- | 5.0 h | (1/2-) | α→259Md | --- |
| 264Lr | 161 | 264.1142 | 106,380.0 | --- | 10.0 h | --- | α→260Md SF | --- |
| 265Lr | 162 | 265.1162 | 108,230.0 | --- | 10.0 h | (1/2-) | α→261Md SF | --- |
| 266Lr | 163 | 266.1199 | 111,660.0 | --- | 22.0 h | --- | SF(100%) | 2014 |