Barium

Symbol: Ba
Atomic Number: 56
Atomic Weight: 137.327
Element Classification: Alkaline-earth Metal
Discovered By: Sir Humphrey Davy
Discovery Date: 1808 (England)
Name Origin: Greek: barys (heavy or dense).

Density (g/cc): 3.5
Melting Point (K): 1002
Boiling Point (K): 1910
Appearance: Soft, slightly malleable, silver-white metal
Atomic Radius (pm): 222
Atomic Volume (cc/mol): 39.0
Covalent Radius (pm): 198
Ionic Radius: 134 (+2e)
Specific Heat (@20C J/g mol): 0.192
Fusion Heat (kJ/mol): 7.66
Evaporation Heat (kJ/mol): 142.0
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 0.89
First Ionizing Energy (kJ/mol): 502.5
Oxidation States: 2
Electronic Configuration: [Xe] 6s2
Lattice Structure: Body-Centered Cubic (BCC)
Lattice Constant (): 5.020
Lattice C/A Ratio: n/a

Mineral Hardness [no units]: 1.25

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