Crossword Genius

#2 on a table (6)

Ross

I believe the answer is:

helium

(Other definitions for helium that I've seen before include "Light colourless gas used in balloons" , "Atomic number 2" , "Light colourless gas, sometimes in balloons" , "Very light, inert gas" , "Second lightest element" .)

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