Number of Isotopes: 7
Electron Affinity (kJ/mol): 50
First Ionization Energy (kJ/mol): 571.9
Second Ionization Energy (kJ/mol): 1126
Third Ionization Energy (kJ/mol): 2200
Electronegativity: 1.2
Polarizability (Å3): 24.5
Atomic Volume (cm3/mol): 19
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 178
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 121
Ionic Radius3+ (pm): 105.2
Common Oxidation Numbers: +3
Other Oxid. Numbers: +2