Number of Isotopes: 1
Electron Affinity (kJ/mol): 222.752
First Ionization Energy (kJ/mol): 890.1
Second Ionization Energy (kJ/mol): 1980
Third Ionization Energy (kJ/mol): Not applicable
Electronegativity: 2.54
Polarizability (Å3): 6.1
Atomic Volume (cm3/mol): 10.2
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 144
Ionic Radius1+ (pm): 151
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 99
Common Oxidation Numbers: +3
Other Oxid. Numbers: -1, +1, +2, +5