Number of Isotopes: 2
Electron Affinity (kJ/mol): 118.5
First Ionization Energy (kJ/mol): 745.4
Second Ionization Energy (kJ/mol): 1957.9
Third Ionization Energy (kJ/mol): 3553.5
Electronegativity: 1.95
Polarizability (Å3): 6.7
Atomic Volume (cm3/mol): 7.1
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 128
Ionic Radius1+ (pm): 91
Ionic Radius2+ (pm): 87
Ionic Radius3+ (pm): 68
Common Oxidation Numbers: +2
Other Oxid. Numbers: +1, +3, +4