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Definition of Atomic number 18
1. Noun. A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere.
Exact synonyms: Ar, Argon
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Substance meronyms: Air
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Substance meronyms: Air
Lexicographical Neighbors of Atomic Number 18
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