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The concept of formal charge is useful because it can help us distinguish between competing skeletal structures or competing resonance structures. In general, which of the following rule(s) apply when we calculate formal charges?

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The sum of all formal charges in an ion must equal the charge of the ion

When formal charge cannot be avoided, negative formal charge should reside on the most electronegative atom

The sum of all formal charges in a neutral molecule must be zero

Small (or zero) formal charges on individual atoms are better than large ones

answer is A, B, C, D.

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