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
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atomic number 90::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Synonyms | th, thorium |
| Type of | metal, metallic element |
| Has types | radiothorium, thorium-228 |
