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 SO3 :
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 SO3 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 SO3 \
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 SO3 are as follows:
The above simple procedure for drawing Lewis electron dot structures is also shown in the following video:
Lewis structures of SO3, Lewis configuration of sulfur trioxide SO3, octet rule, π bonds, 2π electrons, multiple bonds, stable resonance, resonance structures