(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 251.0795886(48) u
| Isotope | Atomic weight/u | Half-life |
| 246 | 246.0688055(22) | 35.7 h 5 |
| 248 | 248.0721851(57) | 333.5 d 28 |
| 249 | 249.0748539(23) | 351 y 2 |
| 250 | 250.0764062(22) | 13.08 y 9 |
| 251 | 251.0795886(48) | 898 y 44 |
| 252 | 252.0816272(56) | 2.645 y 8 |
| 253 | 253.0851345(67) | 17.81 d 8 |
| 254 | 254.087324(13) | 60.5 d 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)
