THORIUM

 THORIUM (90) (Solid)  228(1.913 years)A  230(77,000 years)A 

232(1,400,000,000 years)A

Atomic radius:

Atomic volume:19.9 cm(3)/mol at 300Deg. Kelvin

Atomic weight:232.0381 (Based on Carbon 12)

Boiling point:5061Deg. Kelvin

Covalent radius:1.65Deg. A

Crystal structure:Cubic,face centered

Density:11.7 g/cm(3) at 300Deg. Kelvin

Electrical conductivity:.0653 10(x6)Ohm(x.1) cm(x.1) at 293Deg. Kelvin

Electron configuration:1s(2)2s(2)p(6)3s(2)p(6)3d(10)4s(2)p(6)4d(10)5s(2)p(6)

4f(14)5d(10)6s(2)6d(2)7s(2)

Electronegativity:.1.3 (Pauling's)

First ionization potential:6.08 V

Heat of fusion:16.1 kJ/mol at melting point

Heat of vaporization:514.4 kJ/mol at boiling point

Melting point:02028Deg. Kelvin

Oxidation states:4 basic

Specific heat capacity:.12 Jg(x.1) K(x.1) at 300Deg. Kelvin

Thermal conductivity:.54 W cm(x.1) K(x.1) at 300Deg. Kelvin

Description:A radioactive tetravalent metallic element that occurs combined in

minerals and is usually associated with rare-earths.

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