(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 285.17712(60) u
| Isotope | Atomic weight/u | Half-life |
| 281 | 281.16975(42) | 0.13 s +12-4 |
| 282 | 282.17050(70) | 0.50 ms +33-1 |
| 283 | 283.17327(65) | 4.0 s +13-7 |
| 284 | 284.17416(91) | 101 ms +41-22 |
| 285 | 285.17712(60) | 30 s +30-10 |
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)
