# Simple Method for writing Dot Structures of N_{2}O_{4}

A ** simple procedure for writing Lewis 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 ** dot structures of dinitrogen tetroxide (N _{2}O_{4})**. Dinitrogen tetroxide is a powerful oxidizer that upon conduct spontaneously reacts with hydrazine making the pair a popular fuel for rockets.

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

__Step 1__:
Connect the atoms with
single bonds. The central atoms are the nitrogen atoms.

__Step 2__:

Calculate the # of electrons in π bonds (multiple bonds) using formula (1):

Where n in this case is 6 since N_{2}O_{4} consists of six atoms.

Where V = (6 + 5
+ 5 + 6 + 6 + 6 ) = 34, where V the number of the **valence electrons** of N_{2}O_{4}

Therefore, P = 6n
+ 2 – V = 6 * 6 + 2 – 34 = 4 There
are ** 4π electrons in N _{2}O_{4}**
and that means

**2 double bonds**or a

**triple bond**must be added to the structure in Step 1.

However, all the atoms present are second row elements and cannot accommodate more than 8 valence electrons. Therefore, a triple bond cannot be used as it would place ten electrons around the atoms bonded. The only possible case is that of two double bonds.

__Step 3
& 4__: The **Lewis structures of N _{2}O_{4}** are as follows:

Figure 1: Lewis electron dot structures for N2O4 |

__Relevant Posts__

Lewis Structures|Octet Rule: A Simple Method to write Lewis Structures

Simple method for writing Lewis Structures for N_{2}O_{3}

Simple method for writing Lewis Structures for N_{2}O_{2}

__References__

- G.N. Lewis, J.A.C.S, 38, 762-785, (1916)
- E. C. McGoran, J. Chem. Educ., 68, 19-23 (1991)
- A.B.P. Lever, J. Chem. Educ., 49, 819-821, (1972)

__Key Terms__

** resonance structures of nitrous oxide n2o4**,

__Lewis electron structures of dinitrogen tetroxide,__**,**

__chemical formula of n2o4__**,**

__simple procedure for drawing Lewis structures of dinitrogen tetroxide__

Thank you. This is the best explanation on the web :)

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