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Element 56 - Barium (Ba) sound

From barys, heavy or dense; discovered 1808; It's white sulfate is drunk to outline the stomach and intestines for X-ray examination. Barium nitrate gives fireworks a green color.

Properties

Atomic Number: 56
Atomic Weight: 137.33
Electron Configuration (at ground state): 1s22s22p63s23p63d104s24p64d105s25p66s2
Oxidation States (Bold most stable): +2
Boiling Point (K): 2078
Melting Point (K): 1002
Density (at 300K -- g/cm3): 3.59
Atomic Volume (at 300K -- cm3/mol) 39.0
Number of stable isotopes: 7
Mass Number (Bold naturally occurring) -- Half-Life -- Disintigration Type: 140 -- 12.8 days -- beta particle (electron) emission
Covalent Radius (Å): 1.98
Atomic Radius (Å): 2.22
First Ionization Potential (V): 5.212
Electronegativity (Pauling's): 0.89
Specific Heat Capacity (at 300K -- J g-1 K-1): 0.204
Heat of Vaporization (kJ/mol): 140.2
Heat of Fusion (kJ/mol): 8.01
Electrical Conductivity (at 293K for polycrystalline material -- 106 (ohms)-1 cm-1): 2.8
Thermal Conductivity (at 300K -- W m-1 K-1): 18.4
Crystal Structure: Cubic, body centered
Acid-Base Properties: Very basic