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Th,symbol for the element thoriumthorium
[from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750°C;; b.p. about 4,790°C;; sp. gr. 11.7 at 20°C;; valence +4.
Thorium is a soft, ductile, lustrous, silver-white, radioactive metal.
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The country code for Thailand.