Answer: inertgas

AnswerCrossword Clue
INERTGAS

Krypton or xenon

INERTGAS

Krypton, for one

INERTGAS

Helium or neon

INERTGAS
Neon, for one
INERTGAS
Neon or xenon
INERTGASHelium or krypton
INERTGASRadon, e.g.
INERTGASMolecular nitrogen, e.g.
INERTGASOne won't react under normal circumstances
INERTGASKrypton, e.g.
INERTGASHelium, for one
INERTGASKrypton, in science
INERTGASItem in Group 8A of the periodic table
INERTGASNeon or xenon.
INERTGASNeon or helium
INERTGASNoble thing
INERTGASIt's hard to get a reaction out of it
INERTGASXenon, for one
INERTGASHelium, e.g.
INERTGASItem in the periodic table's last column
INERTGASIt won't react well
INERTGASHe is one