Number of Isotopes: 7
Electron Affinity (kJ/mol): 50
First Ionization Energy (kJ/mol): 603.4
Second Ionization Energy (kJ/mol): 1176
Third Ionization Energy (kJ/mol): 2415
Electronegativity: 1.21
Polarizability (Å3): 21
Atomic Volume (cm3/mol): 24.8
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 193
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 116
Ionic Radius3+ (pm): 100.8
Common Oxidation Numbers: +3
Other Oxid. Numbers: +2