Crossword Genius

One of 2 or more chemical elements with a different atomic weight (7)

Ross

I believe the answer is:

isotope

(Other definitions for isotope that I've seen before include "O, is poet involved in chemical element?" , "One form of element, differing in its neutrons from another" , "elementary variation in it" , "Variant element form" , "Form of atomic nucleus" .)

I've seen this clue in the Sydney Morning Herald.
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