Number of Isotopes: 2
Electron Affinity (kJ/mol): 30
First Ionization Energy (kJ/mol): 558.3
Second Ionization Energy (kJ/mol): 1820.6
Third Ionization Energy (kJ/mol): 2704.5
Electronegativity: 1.78
Polarizability (Å3): 9.7
Atomic Volume (cm3/mol): 15.7
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 167
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): No data
Ionic Radius3+ (pm): 94
Common Oxidation Numbers: +3
Other Oxid. Numbers: +1, +2