Number of Isotopes: 1
Electron Affinity (kJ/mol): 50
First Ionization Energy (kJ/mol): 596.7
Second Ionization Energy (kJ/mol): 1163
Third Ionization Energy (kJ/mol): 2544
Electronegativity: 1.25
Polarizability (Å3): 21.8
Atomic Volume (cm3/mol): 18.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 176
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 117
Ionic Radius3+ (pm): 102
Common Oxidation Numbers: +3
Other Oxid. Numbers: +2