Word:

atomic number 18

Noun1.atomic number 18 - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
Synonyms: Ar, argon
air, Ar, argon, argonon, chemical element, element, inert gas, noble gas
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-- atomic number 18 --
atomic number 19
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atomic number 32
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