odd man out
neon
xenon
chlorine
krypton
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xenon neon chlorine krypton
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Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. ... The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).
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