Number of Isotopes: 6
Electron Affinity (kJ/mol):  
First Ionization Energy (kJ/mol): 589.8
Second Ionization Energy (kJ/mol): 1145.4
Third Ionization Energy (kJ/mol): 4911.8
Electronegativity: 1
Polarizability (Å3): 22.8
Atomic Volume (cm3/mol): 25.9
Ionic Radius2- (pm): No data
Ionic Radius1- (pm): No data
Atomic Radius (pm): 197
Ionic Radius1+ (pm): No data
Ionic Radius2+ (pm): 114
Ionic Radius3+ (pm): No data
Common Oxidation Numbers: +2
Other Oxid. Numbers: