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When drawing renonance structures what general rules are followed concerning formal charges?

When drawing renonance structures what general rules are followed concerning formal charges?
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Answer #1

1. The resonance forms are imagenory. The real structure is a hybrid of the forms we imagine.

2. Nuclei should not be moved but only electrons can delocalise.

3. The total formal charge of the species is to be costant.

Ex:

                                     H - C N: H - C: - = N+

Total formal charge:           0                  - 1 + 1 = 0

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