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It all depends on what combination you can create with the lowest formal charge. If you have a lewis dot structure that should have a neutral charge and each atom has a negative 1 charge and a positive 1 charge that is not going to be as ideal as a lewis structure that has all neutral charges.
Hi! So most of the time, the ideal lewis structure forms when all atoms in the molecule have a formal charge of 0. If this is not possible, then the formal charge should be the lowest possible option (closest to net of 0). When there needs to be a charge, the negative charge should be placed on the more electronegative molecule. For example, take N2O with N as the central atom. The central N atom forms a triple bond with N and single bond with O as opposed to a double bond with both, since that places the negative formal charge on the N rather than the O, which is more electronegative. There is some form of trial and error, but you should be able to narrow it down a bit. Hope this helped!
To find the most ideal lewis structure you want to create one where the base element, or element in the center of the structure, has a formal charge of 0. If the overall molecule is an ion with a charge, then try to have the outer elements which are connected to the main base be the ones that carry the positive or negative charge for the molecule as a whole.
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