Number of Isotopes: 2
Electron Affinity (kJ/mol): 151
First Ionization Energy (kJ/mol): 880
Second Ionization Energy (kJ/mol): Not applicable
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 2.2
Polarizability (Å3): 7.6
Atomic Volume (cm3/mol): 8.5
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 136
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 82
Common Oxidation Numbers: +3, +4
Other Oxid. Numbers: -1, +1, +2, +5, +6