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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 scale)0.89

Specific Heat Capacity0.204 J/g K

Ground State Electron Configuration5p6 6s2

Oxidation States+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