Home 90 Th Thorium back to the periodic table
 
Atomic number   90
Symbol   Th
Atomic weight   232.0381
Density [g/cm3]   11.72
Melting point [°C]   1750
Boiling point [°C]   4200
1st Ionization energy [eV]   6.95
Electronic configuration   [Rn] 6d2 7s2
Oxidation number (most stable)   4
Atomic radius [pm]   179.8 (a)
Ionic radius [pm]   100 (4+)
Abundance in crustal rocks [ppm]   12
Origin of the name   named after Thor, the mythological Scandinavian god of war
Discovery   1829 by the Swedish chemists Jöns Jakob Berzelius
Uses   as nuclear fuel.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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