Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,18,10,2 Orbitals: [Rn] 6d2 7s2 Electronegativity: 1.1, -- 1. Ionization potential: 6.08 eV 2. Ionization potential: 11.504 eV 3. Ionization potential: 20.003 eV Oxidation states: 4 Electrical conductivity: 0.0653 10^6		Melting point: 1750 °C Boiling point: 4000 °C Specific heat: 0.12 J/gK Heat of fusion: 16.10 kJ/mol Heat of vaporization: 514.40 kJ/mol Thermal conductivity: 0.540 W/cmK		Atomic radius: -- Å Ionic radius: 1.05 Å () Covalent radius: 1.65 Å Atomic volume: 19.9 cm³/mol Density (293 K): 11.7 g/cm³ Crystal structure: Cubic: Face centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
226Th	0	226.025	0	30.6m		View
227Th	0	227.028	3/2	18.72d		View
228Th	0	228.029	0	1.913y		View
229Th	0	229.032	5/2	7.34E03y		View
230Th	0	230.033	0	7.54E04y		View
231Th	0	231	5/2	1.063d	-	View
232Th	100	232.038	0	1.40E10y		View
233Th	0	233	1/2	22.3m	-	View
234Th	0	234	0	24.1d	-	View

Legend

Name origin:	Named for Thor, Norse god of thunder.
Description:	Heavy, gray, soft, malleable, ductile, radioactive metal.
Discovered by:	Jöns Berzelius
Year:	1828
Place:	Sweden
Sources:	Found in various minerals like monazite and thorite.
Use(s):	Used in making strong alloys. Also in ultraviolet photoelectric cells. It is a common ingredient in high-quality lenses. Bombarded with neutrons make uranium-233, a nuclear fuel.