(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 258.0984315(50) u
| Isotope | Atomic weight/u | Half-life |
| 248 | 248.08282(26) | 13 s +15-4 |
| 249 | 249.08291(22) | 21.7 s 20 |
| 250 | 250.08441(32) | 25 s +10-5 |
| 251 | 251.084774(20) | 4.27 m 26 |
| 252 | 252.08643(14) | 2.3 m 8 |
| 253 | 253.087144(34) | 6 m +12-3 |
| 254 | 254.08959(11) | 28 m 8 |
| 255 | 255.0910841(73) | 27 m 2 |
| 256 | 256.09389(13) | 77 m 2 |
| 257 | 257.0955424(29) | 5.52 h 5 |
| 258 | 258.0984315(50) | 51.5 d 3 |
| 259 | 259.10051(22) | 1.6 h 6 |
| 260 | 260.10365(34) | 31.8 d 5 |
Units: y = year, d = day, h = hour, m = minute, s = second, ms = millisecond, µs = microsecond.
Numbers in italics are uncertainties with the same unit as the last digit of the half-life.
Atomic weights were obtained from NIST Database 144
The half-life of radioactive isotopes was obtained from the Nuclear Wallet Cards
The Atomic Line List does not contain any data for this element
(Atomic Line List v3.00b5)
