Noble-gas definitions

Any of the elements in Group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert.
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Any of the six gases helium, neon, argon, krypton, xenon, and radon. Because the outermost electron shell of atoms of these gases is full, they do not react chemically with other substances except under certain special conditions.
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(chemistry) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.
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