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Answer:

Because these ions contain more than one atom, they are called polyatomic ions. Polyatomic ions have characteristic formulas, names, and charges that should be memorized. For example, NO3− is the nitrate ion; it has one nitrogen atom and three oxygen atoms and an overall 1− charge.

Polyatomic Ions.

Name     Formula

sulfite ion SO32−

Explanation:
One polyatomic ion is Nitrate. It had a charge of -1.

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