(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 269.12863(39) u
| Isotope | Atomic weight/u | Half-life |
| 258 | 258.11298(44) | 2.9 ms +13-7 |
| 259 | 259.11440(13) | 0.29 s 5 |
| 260 | 260.114384(22) | 4.95 ms 33 |
| 261 | 261.115949(20) | 178 ms 14 |
| 262 | 262.116337(38) | 6.9 ms +38-18 |
| 263 | 263.11829(10) | 1.0 s 2 |
| 264 | 264.11893(30) | 37 ms +27-11 |
| 265 | 265.12109(13) | 14.4 s +37-25 |
| 266 | 266.12198(26) | 21 s +20-12 |
| 269 | 269.12863(39) | 3.1 m +37-11 |
| 271 | 271.13393(63) | 2.4 m +43-10 |
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)
