(this element does not have any stable isotopes)
Atomic weight of the most stable isotope: 259.10103(11) u
| Isotope | Atomic weight/u | Half-life |
| 251 | 251.08894(12) | 0.80 s 1 |
| 252 | 252.088967(10) | 2.44 s 4 |
| 253 | 253.0905641(75) | 1.62 m 15 |
| 254 | 254.090956(11) | 51 s 10 |
| 255 | 255.093191(16) | 3.52 m 21 |
| 256 | 256.0942829(84) | 2.91 s 5 |
| 257 | 257.0968878(74) | 24.5 s 5 |
| 259 | 259.10103(11) | 58 m 5 |
| 260 | 260.10264(22) | 106 ms 8 |
| 262 | 262.10746(39) | ≈ 5 ms |
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)
