atomic number 90

1. 1.

   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

   SynonymsthoriumTh

   Broadermetallic element

   Narrowerthorium-228

Questions about atomic number 90

What does atomic number 90 mean?

atomic number 90 means "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".

What is another word for atomic number 90?

Close synonyms include thorium, Th. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is atomic number 90 a common word?

atomic number 90 is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.