(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 281.16636(89) u
| Isotope | Atomic weight/u | Half-life |
| 272 | 272.15327(25) | 3.8 ms +14-8 |
| 274 | 274.15525(19) | 6.4 ms +307-2 |
| 278 | 278.16149(38) | 4.2 ms +76-17 |
| 279 | 279.16272(51) | 0.17 s +81-8 |
| 280 | 280.16514(61) | 3.6 s +43-13 |
| 281 | 281.16636(89) | 17 s +6-3 |
| 282 | 282.16912(72) | 0.5 s +25-2 |
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)
