Why are the elements of group 18 known as noble gases?
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The noble gases are in Group 18 (8A). They are helium, neon, argon, krypton, xenon, and radon. They were once called inert gases because they were thought to be completely inert—unable to form compounds. ... Noble gases all have a complete octet (eight valence electrons), except for helium (which has only two electrons).
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