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ATOMIC NUMBER 18
Dictionary entry overview: What does atomic number 18 mean?
• ATOMIC NUMBER 18 (noun)
The noun ATOMIC NUMBER 18 has 1 sense:
1. a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
Familiarity information: ATOMIC NUMBER 18 used as a noun is very rare.
Dictionary entry details
Sense 1
Meaning:
A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
Classified under:
Nouns denoting substances
Synonyms:
Hypernyms ("atomic number 18" is a kind of...):
chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
argonon; inert gas; noble gas (any of the chemically inert gaseous elements of the helium group in the periodic table)
Holonyms ("atomic number 18" is a substance of...):
air (a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of)
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