Neon, for one (5,3)

I believe the answer is:

inert gas

(Other definitions for inert gas that I've seen before include "Such as neon or xenon" , "One expects no reaction from such" , "Passive element in the helium group" , "Eg, helium, xenon etc." , "Unreactive "noble" element, such as argon" .)

I've seen this clue in the King Feature Syndicate.

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