Crossword Genius

Form of an atom (7)

Ross

I believe the answer is:

isotope

(Other definitions for isotope that I've seen before include "Atom with the same atomic number as another but with different numbers of neutrons" , "Distinct form of an element" , "Variant element form" , "One of various forms of an elemental atom" , "Form of atomic nucleus" .)

I've seen this clue in The Sun.
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