Thorium
Symbol
Th
Atomic Number
90
Atomic Weight
232.0381
Element Classification
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
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
16.11
Evaporation Heat(kj/mol)
513.7
Thermal Conductivity(@25°C W/m K)
(54.0)
Debye Temperature
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
