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In general, the central element should not be negative, and the outer should not be positive. As long as that is followed, you just want to have the lowest overall charge & for the most part try not to have any charges on a single element above +1 or below -1.
It's most favorable for the central atom to have a formal charge of zero. This is why an expanded octet on the central atom can be more stable than a regular octet. For example, SF6 has an expanded octet on the sulfur atom, but that is the most stable lewis structure.
Would it ever be possible for an element with a radical electron, in a compound, to have a formal charge of zero? As well, is there a lowest amount of elements in a compound where it is unnecessary to calculate formal charge?
The sum of the formal charge should add up to the overall charge of the molecule/ion that you are talking about. If you have to have formal charges, the negative charge would prefer to be in the more electronegative atom when possible.
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