atomic number 90

Noun

Meaning

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

Synonyms

thorium th heavy metal actinide

Hypernyms

metal metallic element

Hyponyms

radiothorium thorium-228

Close letter words and terms

atomic number 88 atomic number 89 atomic number 9 atomic number 91 atomic number 92 atomic number 93