Number of Isotopes: 7
Electron Affinity (kJ/mol): 50
First Ionization Energy (kJ/mol): 592.6
Second Ionization Energy (kJ/mol): 1167
Third Ionization Energy (kJ/mol): 1991
Electronegativity: 1.17
Polarizability (Å3): 23.5
Atomic Volume (cm3/mol): 19.9
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 180
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 107.8
Common Oxidation Numbers: +3
Other Oxid. Numbers: +1, +2