Francis, Arthur W., Sr. Formerly, Union Carbide Corporation, Tarrytown, New York.
Last reviewed:January 2019
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The group 18 elements of the periodic table. Although they are largely unreactive, the noble gases are no longer considered strictly inert, since compounds of xenon, krypton, argon, and radon have been synthesized (see illustration). The term rare gases is a misnomer, since argon is plentiful and helium is not rare in the United States and some other countries. See also: Argon; Helium; Krypton; Neon; Periodic table; Radon; Xenon
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