(Polar molecules, Non-polar molecules, etc.)
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When using the Lewis Structure of a molecule to determine the molecular shape, should we use the lowest energy Lewis Structure by checking formal charges, and using the octet exceptions (expanded octet, etc.) when necessary?
I believe that it would be best to use the Lewis Structure with the lowest energy and with octet exceptions because it would give a more accurate representation of the shape of the molecule. If we were to ignore formal charges and octet exceptions, we might miss a crucial double bond that could help us determine an accurate molecular shape.
Yes, I always use the Lewis structure with the lowest energy by looking at the formal charges because this corresponds to the most likely molecular shape of the compound. And also make sure you satisfy the octet rule and its exceptions!
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