chart of inert gases
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The INERT GASES; helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Ra) and element 118 (Uuo) occupy the rightmost group of the periodic table. ... The extremely low chemical reactivity of the noble gasesis due them having a "complete valence shell". They tend not to gain or lose electrons.
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