Crossword Genius

Cl- or Na+ (3)

Ross

I believe the answer is:

ion

(Other definitions for ion that I've seen before include "Subatomic particle" , "Electrically charged atom or group of atoms" , "Electrically-charged particle" , "Electrically charged particle" , "Particle (phys.)" .)

I've seen this clue in the King Feature Syndicate.
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