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Any one of the seven chemical elements that compose Group 18 (VIIIa) of the periodic table is referred to as a noble gas. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson are the constituent elements.

The noble gases are inflammable, tasteless, colorless, and odorless. Since it was thought for many years following their discovery that their atoms could not link to those of other elements to form chemical compounds, they have historically been referred to as Group 0 elements in the periodic table. Group 18 is a more suitable categorization for them as a result of their electrical structures and the discovery that some of them do in fact form compounds.

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