# Simple Method for writing Lewis Electron Dot Structures

# of chlorine perchlorate Cl_{2}O_{4}

A ** simple procedure for writing Lewis electron dot structures** is given in a previous article entitled “Lewis Structures and the Octet Rule”. Several worked examples relevant to this procedure were given in previous posts please see the ** Sitemap - Table of Contents (Lewis Electron Dot Structures)**.

Another example for writing Lewis structures following the above procedure is given below.

Let us consider the case of the** Lewis electron dot structures of chlorine perchlorate Cl _{2}O_{4}**

How can we construct the **Lewis structure of Cl _{2}O_{4}**?

__Step 1__:
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 6 since Cl_{2}O_{4} consists of six atoms.

Where V = (6 + 7 + 6 * 2 + 6 + 7) = 38

Therefore, P = 6n + 2 – V = 6 * 6 + 2 – 38 = 0

**So there are no π electrons in Cl _{2}O_{4} and therefore the structure of Step 1 is the Lewis structure.**

Electrons are placed around each atom so that the octet rule is obeyed. **Formal charges** are assigned and equalized using ** resonance**.

__Step 3
& 4__: The **Lewis structures for Cl _{2}O_{4 }**are derived below:

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