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How do you determine the lowest energy lewis structure? For example some structures break the octet rule to get the lowest energy structure. Does that mean formal charges are more important than the octet rule in determining the lowest energy?
Ideally you want your central atom to have a formal charge of zero or as close as you can get to it. The octet rule can only be broken if that element is able to break it. Elements from period three or higher have d-orbitals, allowing them to accommodate for more electrons. So just make sure that if you are breaking the octet rule to obtain a better formal charge for your central atom that you are able to !
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