(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 247.0703541(47) u
| Isotope | Atomic weight/u | Half-life |
| 243 | 243.0613893(22) | 29.1 y 1 |
| 244 | 244.0627528(19) | 18.1 y 1 |
| 245 | 245.0654915(22) | 8423 y 74 |
| 246 | 246.0672238(22) | 4706 y 40 |
| 247 | 247.0703541(47) | 1.56e+7 y 5 |
| 248 | 248.0723499(56) | 3.48e+5 y 6 |
| 250 | 250.078358(12) | ≈ 8.3e+3 y |
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)
