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Yes, the structure where the formal charge(s) are closest to 0 is dominant. However, when there are resonance structures (for example, NO3-), that means that for the Lewis structures, we draw different configurations of electrons (single bond, double bond, etc) among the same configuration of atoms. Although it might appear that there are 3 structures for NO3-, for example, none of them are "dominant". They all have the same formal charge, and the actual structure of the ion is a blend of all 3 of those structures. So just make sure you understand those two different concepts.
In some cases, multiple resonance structures can have a formal charge of 0, and if that structure has a central atom, a good way of determining which one is the most stable structure is to find the one where the central atom has a formal charge of 0.
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