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Fixing error: molecule has zero charge, ion has positive or negative charge
A '''polyatomic ion''' is a [[molecule]] which has a positive or negative electrical [[charge]].
A '''polyatomic ion''' is a group of atoms bound together, with a positive or negative electrical [[charge]]. It's not a [[molecule]], because a molecule has neutral (zero) charge.
*[[Acetate]] (CH<sub>3</sub>COO<sup>-</sup>)
*[[Acetate]] (CH<sub>3</sub>COO<sup>-</sup>)