Crossword Genius

Heavy hydrogen, e.g. (7)

Ross

I believe the answer is:

isotope

(Other definitions for isotope that I've seen before include "may be radioactive" , "Type of atom, maybe radioactive" , "O, is poet involved in chemical element?" , "Atom with the same atomic number as another but with different numbers of neutrons" , "Variant element form" .)

I've seen this clue in the Universal.
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