- 1. n. 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 Source: wordnet
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atomic number 90
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elementisotopemetallicmonazitenuclearoccurspowerradioactivereactorssandssilvery-whitesoftsourcetetravalentthorite
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atomicatomic bombatomic clockatomic cocktailatomic energyAtomic Energy Commissionatomic explosionatomic massatomic mass unit
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