### Lewis Structures for sulfur trioxide (SO3)

A

**simple procedure for writing Lewis structures**is given in a previous article entitled “Lewis Structures and the Octet Rule”. Relevant worked examples were given in the following articles: Examples #1, #2, #3 and #4.

A few more examples for writing

**Lewis structures**following the above procedure are given bellow:

Let us consider the case of

**sulfur trioxide SO**_{3}:**Step 1: The central atom will be the S atom since it is the less electronegative**. Connect the atoms with single bonds:

**Step 2: Calculate the # of electrons in π bonds (multiple bonds) using formula (1) in the article entitled “Lewis Structures and the Octet Rule”.**

Where n in this case is 4 since SO

_{3}consists of four atoms.
Where V = (6 + 6 + 6 + 6) = 24

Therefore, P = 6n + 2 – V = 6 * 4 + 2 – 24 = 2

**\Therefore there are 2****π electrons in****SO**_{3}**\****1 double bond must be added to the structure of Step 1.**

**Step 3 & 4: One double bond must therefore be placed through the 3 S-O bonds. Therefore, the Lewis structures for SO**:

_{3}are as follows**Relevant Posts**

**Key Terms**

**Lewis structures of SO3, Lewis configuration of sulfur trioxide SO3, octet rule, π bonds, 2π electrons, multiple bonds, stable resonance, resonance structures**

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