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The most stable configuration is one in which its formal charge would be 0. This can be determined with the formula V-(L+S/2), where v is the valence electrons, L is the lone pair of electrons and S is the shared electrons over 2.
The most stable configuration for a resonance structure would be one where the formal charge is closest to 0, which could be find with the equation FC= V (valence electrons) - (L (lone pair electrons) + s/2 (shared electrons divided by 2).
The most stable configuration is when the formal charges for all elements of that compound are zero or closest to zero. Formal charge is the number you get when you subtract the number of bonds and lone pair electrons from the valence electrons of an element. If you have a positive formal charge next to a negative formal charge, there is a more stable form than what you have.
The most stable configuration is one where you get as many formal charges equal to zero as you can. In the case that you cannot get all formal charges equal to zero, try to change it so that the sum of all the formal charges is zero. Also, try to put the negative formal charge on the more electronegative atoms.
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