Symbol	Th	Atomic radius: pm	180	Fusion: kJ/Mole	13.81
Name	Thorium	Ionic radius: pm	(+4)94	Boiling point: °C	4788
Atomic number	90	Electron affinity	-	Melting point: °C	1750
Atomic weight	232.0	1st  ion potential	6.08	Specific Heat Cap: J/(g K)	0.11
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.54
Configuration	[Rn]6d27s2	Crystal structure	FCC	Electrical Cond	0.0653
Oxidation states	4	Density	11.7	Abundance: mg/kg-crust	9.6
Electronegativity	1.3	Vaporization: kJ/Mole	543.9
Thorium was discovered by Jöns Jacob Berzelius in 1828.			Uses -  gas mantles, strong alloys, ultraviolet photoelectric cells, laboratory crucibles, source of nuclear energy