Number of Isotopes: 1
Electron Affinity (kJ/mol): 18.1
First Ionization Energy (kJ/mol): 631
Second Ionization Energy (kJ/mol): 1235
Third Ionization Energy (kJ/mol): 2389
Electronegativity: 1.36
Polarizability (Å3): 17.8
Atomic Volume (cm3/mol): 15
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 162
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 88.5
Common Oxidation Numbers: +3
Other Oxid. Numbers: +1, +2