atomic number 18

1. 1.

   a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere

   SynonymsargonAr

   Broaderchemical elementnoble gas

Questions about atomic number 18

What does atomic number 18 mean?

atomic number 18 means "a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere".

What is another word for atomic number 18?

Close synonyms include argon, Ar. 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.