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Noun: atomic number 18
  1. A colourless and odourless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
    - argon, Ar

Type of: argonon, inert gas, noble gas

Part of: air

Nearest

atomic number 113
atomic number 114
atomic number 115
atomic number 116
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 2
atomic number 20
atomic number 21
atomic number 22
atomic number 23
atomic number 24
atomic number 25
atomic number 26
atomic number 27