# What are all resonance structures for SO3?

Sep 22, 2014

There are seven resonance structures for ${\text{SO}}_{3}$.

#### Explanation:

When you draw the Lewis structure, you first get the three structures at the top.

In each of them, $\text{S}$ has a formal charge of +2 and two of the $\text{O}$ atoms have formal charges of -1.

In each of the three structures in the middle, $\text{S}$ has a formal charge of +1 and one of the $\text{O}$ 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.