Atomic Number: 56

Name: Barium

Atomic symbol: Ba

Atomic Weight: 137.33

Electron configuration: 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶6s²

Ionization energies: 503 kJ/mol; 965 kJ/mol; 3,430 kJ/mol

Pauling electronegativity: 0.9

Melting Point: 725^oC

Boiling Point: 1640^oC

Density: 3.51 g/cm³

Standard potential (volts), M⁺ + e^- ---> M: -2.90

Covalent radius: 1.98 angstroms

Ionic radius: 1.49 angstroms (+1), 1.34 angstroms (+2)

Common oxidation states in compounds: +1, +2