Crossword Genius

First noble gas, alphabetically (5)

Ross

I believe the answer is:

argon

(Other definitions for argon that I've seen before include "Gaseous element" , "Inert gas, symbol Ar" , "Inert gas in atmosphere" , "Inert gas, present in small amounts in the air" , "Chemical element" .)

I've seen this clue in The New York Times.
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