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:

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

**\ 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:

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