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QUESTION
What are all resonance structures for SO3?
There are seven resonance structures for ##"SO"_3##.
When you draw the Lewis structure, you first get the three structures at the top.
In each of them, ##"S"## has a formal charge of +2 and two of the ##"O"## atoms have formal charges of -1.
In each of the three structures in the middle, ##"S"## has a formal charge of +1 and one of the ##"O"## atoms has a formal charge of -1.
In the bottom structure, all atoms have a formal charge of zero.
From the point of view of formal charges, the bottom structure is the most stable structure.
