Input interpretation
Fm-259 (fermium-259)
Decay properties
half-life | 1.5 seconds (1.18 to 1.82 s) mean lifetime | 2.2 seconds (1.71 to 2.62 s) decay constant | 0.45 per second specific activity | 1.1×10^9 TBq/g (terabecquerels per gram) width | 3×10^-16 eV (electronvolts) decay modes | SF (spontaneous fission)
Decay mode
decay mode | SF (spontaneous fission)
Mass properties
atomic number (Z) | 100 mass number (A) | 259 neutron number | 159 atomic mass | 259.100595 u (unified atomic mass units) mass excess | 93.704 MeV (megaelectronvolts) binding energy per nucleon | 7.407 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 3/2^+ (atomic fermion)
Quantum properties