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Thorium 1

Definition: A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; formerly called also thorinum. Symbol Th. Atomic weight

thorium 2

Definition: a soft silvery-white tetravalent radioactive metallic element; isotope is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

 

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