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A molecule is most stable when all of the atoms have the lowest possible formal charge. If you think you have found the correct structure, check formal charges and if they are mostly 0 or +/-1 to 2, that is an indication that your structure is correct
Lewis structures with formal charges of each atom that are closest to 0 represent the lowest energy arrangement of the atoms and electrons within a molecule. So, the lowest formal charges of a molecule are typically more representative of the true nature of that molecule.
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