Crossword Genius

Type of element (3)

Ross

There are a few possibilities for this:

Which length description are you looking for?:

3

5 4,5

(Other definitions for gas that I've seen before include "Eg, oxygen" , "eg CO2" , "natural resource" , "16 (US)" , "Oxygen is one" .)

I've seen this clue in The Mirror and The Independent.
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