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Calculating Formal Charges and Resonance: Example Questions

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Calculate the formal charge on the indicated atom in each of the following molecules or ions. Some molecules may have more than one possible resonance structure, each resulting in a different possible formal charge on the indicated atom. In such cases, supply both unique formal charge values separated by commas.

The central oxygen atom in O3
Phosphorus in PF6-
Nitrogen in NO2
Iodine in ICl3
Chlorine in HClO4 (hydrogen is bonded to O)

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