Crossword Genius

Nitrogen's atomic number (5)

Ross

I believe the answer is:

seven

(Other definitions for seven that I've seen before include "Numeral" , "Number of seas sailed?" , "Number of Wonders of the World" , "So many ages of man (AYLI)" , "- Against Thebes (Aeschylus)" .)

I've seen this clue in The Washington Post.
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