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You have to test it because some lewis structures are more stable than others and the formal charge shows this stability in number terms. There are also resonance structures, but they are all the same in terms of formal charge and stability.
The formal charge gives an indication of the extent to which atoms have gained or lost electrons in the process of covalent bond formation. Atom arrangements and Lewis structures with the lowest formal charges are likely to have the lowest energy.
Elements are the most stable when their FC is 0. You want the atoms with the highest electronegativity to have the lowest formal charge possible. Once you reach that, you want the overall FC to be as close to zero as well. This give you the lowest energy structure of a substance.
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