noble gas

Noun
  1. Any of the chemically inert gaseous elements of the helium group in the periodic table (synset 114648547)
    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
    • gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
    subtypes:
    • ar, argon, atomic number 18 - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
    • atomic number 2, he, helium - a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
    • atomic number 36, kr, krypton - a colorless element that is one of the six inert gasses; occurs in trace amounts in air
    • atomic number 10, ne, neon - a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
    • atomic number 86, radon, rn - a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
    • atomic number 54, xe, xenon - a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
    same as: argonon, inert gas

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