Input interpretation
![Fm-259 (fermium-259)](../image_source/11678986a2bb1aa7574dd65f70509005.png)
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)](../image_source/f90e2b0550b1605722cb2f05830c1e67.png)
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)](../image_source/443de4feafcd4a021fab80c15370cda7.png)
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)](../image_source/a522cee0fb4deba0325b9f55d2b7bae5.png)
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](../image_source/fbb34fd5bc62bb3f558a3c42f38f6fd2.png)
Mass properties
Nearby isotopes
![Nearby isotopes](../image_source/2c044669c5b6b17175661c1e2828aceb.png)
Nearby isotopes
Quantum properties
![spin parity J^π | 3/2^+ (atomic fermion)](../image_source/93086c5e757c1fe90719e880828145dc.png)
spin parity J^π | 3/2^+ (atomic fermion)
![Quantum properties](../image_source/c49249d8abacba4404a68142e0da4caa.png)
Quantum properties