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I have a question about the sulfate lewis structure that was in the 5/11/18 notes. The TA's did an example with sulfate and I was wondering if there are other resonance structures associated with it. For example, in sulfate they wrote that there are 2 single bonds and 2 double bonds. The 2 double bonds were written on the right and bottom of sulfur attached to oxygen. Could there be a resonance structure where it is mirrored (double bond on left and top of sulfur)? I hope my question makes sense.
Formal charge can identify the correct lewis structure when there are multiple options as you said. The one that doesn't break the octet rule (unless it has an expansion octet) and that has a formal charge closest to 0 or exactly 0 is the most stable structure.
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