Crossword Genius

Helium & krypton

Ross

I believe the answer is:

gases

(Other definitions for gases that I've seen before include "Eg, oxygen, helium" , "Vapours" , "Such as neon, hydrogen" , "Eg, O, H, Ne, CO, etc." , "Eg, helium, nitrogen" .)

I've seen this clue in The Mirror.
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