Number of Isotopes: 2
Electron Affinity (kJ/mol): 50.7
First Ionization Energy (kJ/mol): 650.3
Second Ionization Energy (kJ/mol): 1413.5
Third Ionization Energy (kJ/mol): 2828
Electronegativity: 1.63
Polarizability (Å3): 12.4
Atomic Volume (cm3/mol): 8.3
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 134
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 93
Ionic Radius3+ (pm): 78
Common Oxidation Numbers: +5
Other Oxid. Numbers: -1, +1, +2, +3, +4