Lewis
Structures and the Octet Rule: A Simple Method to write
Lewis
Structures > Simple
Procedure for writing

l1/DTD

**Lewis structures**– Example #1l1/DTD

**A simple procedure for writing Lewis structures**is given in a previous articleTD entitled “Lewis Structures and the Octet Rule”.
Examples for writing

**Lewis structures**following the above procedure are givenDTD bellow:
Consider the case of

**ozone O**. Ozone is a very reactive gas, and even at low concentrations it is irritating and toxic. Event though it represents only a tiny fraction of the atmosphere is crucial for life on earth. Let us draw the Lewis Structures for ozone:_{3}
Step1: The central atom will be one of the oxygen atoms. Connect the
3 atoms
with

**single bonds**
O – O – O

Step 2: Calculate the # of

**electrons**in π bonds (pi bonds, multiple bonds) using formula (**1)**in the article entitled “Lewis Structures and the Octet Rule”.
Where n in this case is 3 since O

_{3}consists of three atoms
Where V = (6 + 6 + 6 ) = 18

Therefore, P = 6n + 2 – V = 6 * 3 + 2 – 18 =
2

**So there are 2****π electrons (pi electrons) in O**_{3}^{ }and therefore**1 double bond must be added to the structure of Step 1.**
Step 3 &
4: The 2 atoms are
joined
together with a

**double bond**. Therefore the Lewis structure for**O**is as follows:_{3}

Figure 1: Lewis structures for
O There are two equivalent resonance
structures so in the molecule the bond between the O atoms is something
between a double and a single bond. This fact has been proved
experimentally_{3.} |

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