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Barium  SEE PERIODIC TABLE
see article  SEE FULL ARTICLE

Atomic Number56
Atomic SymbolBa
Atomic Weight137.327 amu
GroupAlkaline Earth, 2
FormSolid
Density @ STP3.62 g/cm3
Melting Point727 °C (1340.6 °F, 1000.15 °K)
Boiling Point1897 °C (3446.6 °F, 2170.15 °K)
Heat of Fusion7.12 kJ/mol
Heat of Vaporization140 kJ/mol
First Ionization Potential5.21170 eV
Electronegativity (on Pauling scale0.89
Specific Heat Capacity0.204 J/g K
Ground State Electron Configuration5p6 6s2
Oxidation State(s)+2
Stable Isotopes and Natural Abundance on Earth130Ba, 0.106%; 132Ba, 0.101%; 134Ba, 2.417%; 135Ba, 6.592%; 136Ba, 7.854%; 137Ba, 11.23%; 138Ba, 71.70%
Selected Radioisotopes133Ba, 140Ba
Atomic Radius253 pm
Crystal StructureCubic
Discovered byDavy, 1808