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Thorium

Th Thorium
90
232.0381
10
Symbol
Th
Atomic Number
90
Atomic Weight
232.0381
Discovered By
Jons Jacob Berzelius
Discovery Date
1828 (Sweden)
Name Origin
Named for Thor, Norse god of thunder.
Density (g/cc)
11.78
Melting Point (K)
2028
Boiling Point (K)
5060
Appearance
Gray, soft, malleable, ductile, radioactive metal
Atomic Radius (pm)
180
Atomic Volume (cc/mol)
19.8
Covalent Radius (pm)
165
Ionic Radius
102 (+4e)
Specific Heat
0.113
Fusion Heat (kJ/mol)
16.11
Evaporation Heat (kJ/mol)
513.7
Thermal Conductivity (@25°C W/m K)
(54.0)
Debye Temperature (K)
100.00
Pauling Negativity Number
1.3
First Ionizing Energy (kJ/mol)
670.4
Oxidation States
4
Electronic Configuration
[Rn] 6d2 7s2
Lattice Structure
Face-Centered Cubic(FCC)
Lattice Constant
5.080
Lattice C/A Ratio
n/a

KEY

SEE ALSO

Thorium

Columbia Encyclopedia

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