Barium
Symbol
Ba
Atomic Number
56
Atomic Weight
137.327
Element Classification
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
0.192
Fusion Heat (kJ/mol)
7.66
Evaporation Heat (kJ/mol)
142.0
Thermal Conductivity (@25°C W/m K)
(18.4)
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
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