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Answer: INERTGAS
INERTGAS is a crossword puzzle answer that we have spotted 18 times.
Neon or helium
Krypton, e.g.
Noble thing
Helium or neon
Krypton, for one
Helium or krypton
Radon, e.g.
Molecular nitrogen, e.g.
One won't react under normal circumstances
Neon or xenon
Xenon or neon
It's hard to get a reaction out of it
Neon, for one
Krypton, for instance
Neon, e.g.
He is one
It won't react well
Xenon, e.g.