. . . "0"^^ . . . . "113819063"@en-us . . . . . . . . . . "a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands"@en-us . . . "thorium"^^ . "a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands"@en-us . "thorium"@en-us . . . . . "110504343"@en-us . . "14658109-n"^^ . . . . "Th"@en-us . "114658109"^^ . "0"^^ . . "atomic number 90"@en-us .