Word:

atomic number 90

Noun1.atomic number 90 - 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
Synonyms: thorium, Th
metal, metallic element, monazite, radiothorium, Th, thorite, thorium, thorium-228
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-- atomic number 90 --
atomic number 91
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