Number of Isotopes: 5
Electron Affinity (kJ/mol): 120
First Ionization Energy (kJ/mol): 762.1
Second Ionization Energy (kJ/mol): 1537.4
Third Ionization Energy (kJ/mol): 3301.7
Electronegativity: 2.01
Polarizability (Å3): 6.1
Atomic Volume (cm3/mol): 13.6
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 122.3
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 87
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: -4, +2, +4
Other Oxid. Numbers: +1, +3