Underline the word which does not belong to the group Helium Xenon organ and radon
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Noble gas. 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), andoganesson (Og
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