Thorium Periodic table of Elements

walterericsy

Quezon City, Philippines

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Thorium is a chemical element with symbol Th and atomic number 90. A radioactive actinide metal, thorium is one of only four radioactive elements that still occur in quantity in nature as a primordial element (the other three being bismuth, plutonium, and uranium).[a] It was discovered in 1828 by the Norwegian mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius, who named it after Thor, the Norse god of thunder.

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