(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 266.11983(56) u
| Isotope | Atomic weight/u | Half-life |
| 252 | 252.09526(26) | 0.36 s +11-7 |
| 253 | 253.09509(22) | 0.57 s +7-6 |
| 254 | 254.09648(32) | 18.4 s 18 |
| 255 | 255.096562(19) | 31.1 s 13 |
| 256 | 256.098494(89) | 27 s 3 |
| 257 | 257.099418(47) | ≈ 4 s |
| 258 | 258.10176(11) | 4.1 s 3 |
| 259 | 259.102902(76) | 6.2 s 3 |
| 260 | 260.10550(13) | 180 s 30 |
| 261 | 261.10688(22) | 39 m 12 |
| 262 | 262.10961(22) | ≈ 4 h |
| 266 | 266.11983(56) | 11 h +21-5 |
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)
