Number of Isotopes: 1
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 568
Second Ionization Energy (kJ/mol): Not applicable
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 1.5
Polarizability (Å3): 25.4
Atomic Volume (cm3/mol): 15
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 163
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 118
Common Oxidation Numbers: +5
Other Oxid. Numbers: +3, +4