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The compound is neutral; the ions are Al(3+) and (NO3)-.

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To determine the sign and value of the charge on a polyatomic ion, you need to look at the sum of the charges of the atoms that make up the ion. The charge is usually indicated in the chemical formula of the ion. If the ion has gained electrons, it will have a negative charge, and if it has lost electrons, it will have a positive charge.


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