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 (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
