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Noble gas
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Group of low-reactive, gaseous chemical elements
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Wikipedia

The noble gases (historically the inert gases, sometimes referred to as aerogens) are the members of group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and, in some cases, oganesson (Og). Under standard conditions, the first six of these elements are odorless, colorless, monatomic gases with...

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Group (periodic table)
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Chemical element
Elementary substance
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Periodic table
References
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