- Types:
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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
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He, atomic number 2, 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)
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Kr, atomic number 36, krypton
a colorless element that is one of the six inert gasses; occurs in trace amounts in air
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Ne, atomic number 10, 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
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Rn, atomic number 86, radon
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
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Xe, atomic number 54, xenon
a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
