Number of Isotopes: 2
Electron Affinity (kJ/mol): 31.1
First Ionization Energy (kJ/mol): 761
Second Ionization Energy (kJ/mol): Not applicable
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 1.5
Polarizability (Å3): 13.1
Atomic Volume (cm3/mol): 10.9
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 146
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 86
Common Oxidation Numbers: +5
Other Oxid. Numbers: -1, +2, +3, +4