Input interpretation
Al-21 (aluminum-21)
Decay properties
half-life | 35 ns (nanoseconds) (0 to 39 ns) mean lifetime | 50 ns (nanoseconds) (-6.675×10^-299 to 51.4 ns) decay constant | 2×10^7 per second specific activity | 5.7×10^17 TBq/g (terabecquerels per gram) width | 1.3×10^-8 eV (electronvolts) decay modes | p (proton emission) final decay products | F-19 (0) | Ne-20 (0) | O-16 (0)
Decay mode
decay mode | p (proton emission) Q-value | 1.26 MeV (megaelectronvolts) daughter nuclide | Mg-20
Decay chain
Decay chain
Mass properties
atomic number (Z) | 13 mass number (A) | 21 neutron number | 8 atomic mass | 21.02804 u (unified atomic mass units) mass excess | 26.119 MeV (megaelectronvolts) binding energy per nucleon | 6.343 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^+ (atomic boson)
Quantum properties