(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 268.12567(57) u
| Isotope | Atomic weight/u | Half-life |
| 255 | 255.10707(45) | 1.6 s +6-4 |
| 256 | 256.10789(26) | 1.6 s +5-3 |
| 257 | 257.10758(22) | 2.3 s 2 |
| 258 | 258.10928(33) | 4.2 s +4-3 |
| 259 | 259.109492(57) | 0.51 s 16 |
| 260 | 260.11130(10) | 1.52 s 13 |
| 261 | 261.11192(12) | 1.8 s 4 |
| 262 | 262.11407(15) | 35 s 5 |
| 263 | 263.11499(18) | 27 s +10-7 |
| 267 | 267.12247(44) | 73 m +350-33 |
| 268 | 268.12567(57) | 32 h +11-7 |
| 270 | 270.13136(64) | 1.0 h +19-4 |
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)
