Number of Isotopes: 3
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 584
Second Ionization Energy (kJ/mol): Not applicable
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 1.7
Polarizability (Å3): 27.4
Atomic Volume (cm3/mol): 12.5
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 156
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 116.5
Common Oxidation Numbers: +6
Other Oxid. Numbers: +3, +4, +5