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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.