(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 281.16451(59) u
| Isotope | Atomic weight/u | Half-life |
| 269 | 269.144752(34) | 179 µs +245-6 |
| 270 | 270.144584(52) | 0.10 ms +14-4 |
| 271 | 271.14595(10) | 1.63 ms +44-2 |
| 273 | 273.14856(14) | 0.17 ms +17-6 |
| 277 | 277.15591(41) | 4.1 ms +37-13 |
| 279 | 279.16010(64) | 0.18 s +5-3 |
| 281 | 281.16451(59) | 13 s +5-3 |
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)
