Chemical relative

This time we are looking on the crossword clue for: Chemical relative.
it’s A 17 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ISOTOPE, ISOMER.

Last seen on: –L.A. Times Daily Crossword – Oct 9 2022
Universal Crossword – Oct 28 2021
LA Times Crossword 9 Nov 20, Monday
The Washington Post Crossword – Nov 9 2020