Number of Isotopes: 7
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 1007
Second Ionization Energy (kJ/mol): 1810
Third Ionization Energy (kJ/mol): 3300
Electronegativity: 2
Polarizability (Å3): 5.4
Atomic Volume (cm3/mol): 14.8
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 151
Ionic Radius1+ (pm): 133
Ionic Radius2+ (pm): 116
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +1, +2
Other Oxid. Numbers: