atomic number 18

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Noun atomic number 18 has 1 sense

argon, Ar, atomic number 18 - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
--₁ is a kind of chemical element, element; noble gas, inert gas, argonon
--₁ is a substance of air

atomic number 10 atomic number 11 atomic number 12 atomic number 13 atomic number 14 atomic number 15 atomic number 16 atomic number 17 atomic number 18 atomic number 19 atomic number 21 atomic number 22 atomic number 23 atomic number 24 atomic number 25 atomic number 26 atomic number 27

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