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Different resonance structures may have different formal charges for the atoms that are double bonded in one and are single bonded in the other. Just look at the overall charge of the molecule and make sure your formal charges add up.
The formal charges differ because in some structures, the atoms have double bonds, single bonds, or Lone pairs. The major contributor is the one closest to a 0 total formal charge, and if that isn't possible usually the central atom should have 0 charge unless it violates the octet rule.
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