atomic number 69

1. 1.

   a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

   SynonymsthuliumTm

   Broadermetallic element

Questions about atomic number 69

What does atomic number 69 mean?

atomic number 69 means "a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime".

What is another word for atomic number 69?

Close synonyms include thulium, Tm. 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 69 a common word?

atomic number 69 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.