atomic number 18

Noun
  1. A colorless and odorless inert gas;
    One of the six inert gases;
    Comprises approximately 1% of the earth's atmosphere (synset 114653098)
    is a type 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
    substance meronym: air - a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of
    same as: ar, argon

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