NO 2 is a free radical. When it is in the presence of sun light, reacts with oxygen gas and produce NO and atomic oxygen. This is an initial step of photochemical smog which is occurred at cities which have high traffics. Oxygen is more electronegative than nitrogen. Therefore electrons of bonds are attracted towards oxygen atoms more than nitrogen. De to those bonds, nitrogen partially loses its three electron.
But, wait. When your consider last shell of nitrogen atom, nitrogen belongs only four electrons. At room temperature, nitrogen dioxide is a brown colour gas. In lewis structure of NO 2 , there is a unpaired electron on nitrogen atom. That unpaired electron is the reason for showing colours by NO 2 molecule.
There is an unpaired electron on nitrogen atom. Therefore the molecule has three electron pairs around nitrogen atom and is trigonal planar for electron pair geometry. The one lone electron exerts a less repulsion than normal on the two bonding oxygen atoms so they are able to spread out more to a 0 bond angle from the ideal of 0.
In the lewis structure of NO 2 , there is a unpaired electrons on nitrogen atom. But in the NO 2 - lewis structure, there is lone pair on nitrogen atom. Steps of drawing NO 2 lewis structure Following steps are required to draw the NO 2 lewis structure and they are explained in detail in this tutorial.
Find total number of electrons of the valance shells of nitrogen and oxygen atoms Total electrons pairs Center atom selection Put lone pairs on atoms Check the stability and minimize charges on atoms by converting lone pairs to bonds.
Total number of electrons of the valance shells of nitrogen and oxygen atoms Nitrogen and oxygen are located at VA and VIA groups respectively in the periodic table. Center atom of NO 2 To be the center atom, ability of having greater valance is important. Lone pairs on atoms There are already two N-O bonds in the sketch. Mark unpaired electron on nitrogen atom. Check the stability and minimize charges on atoms by converting lone pairs to bonds The drawn structure is not a stable one because both oxygen atoms and nitrogen atoms have charges.
NO 2 structure The bond length between the nitrogen atom and the oxygen atom is There is a unpaired electron on nitrogen atom in NO2 lewis structure. Cannot it be shifted to an oxygen atom? Effect of unpaired electron NO 2 is a free radical. Oxidation number of NO 2 Oxygen is more electronegative than nitrogen.
What is the colour of NO 2? I have heard that it is brown colour. Is it true. Why NO 2 has a colour? NO 2 structure? Now one valence electrons pair is remaining. Mark that remaining one on nitrogen atom. The drawn structure for NO 2 - is not a stable one because both oxygen atoms and nitrogen atoms have charges. Now, we should try to minimize charges by converting lone pair s which exist on oxygen atoms to bonds. So we convert one lone pair of one oxygen atom as a N-H bond. Now there is a double bond between nitrogen and one oxygen atom.
There is a single bond also with nitrogen atom and other oxygen atom. In new structure, charges of atoms reduced. Now there is no any charge on one oxygen atom and nitrogen atom.
Now you understand this structure of NO 2 - is more stable than previous structure due to less charges. We cannot convert more lone pairs of other oxygen atom to make a bond with nitrogen atom because nitrogen cannot keep more than eight electrons in its last valence shell.
Now, we are going to learn, how to draw this lewis structure. Steps of drawing NO 2 - lewis structure Following steps are required to draw NO 2 - lewis structure and they are explained in detail in this tutorial. Find total number of electrons of the valance shells of nitrogen and oxygen atoms and charge of the anion Total electrons pairs Center atom selection from nitrogen and oxygen atom Put lone pairs on atoms Stability of lewis structure - Check the stability and minimize charges on atoms by converting lone pairs to bonds.
Total number of electrons of the valance shells of nitrogen and oxygen atoms and charge of the anion There are one nitrogen atom and two oxygen atoms in the nitrate ion. Also there is a -1 charge. Center atom of NO 2 - To be the center atom, ability of having greater valance is important.
Lone pairs on atoms There are already two N-O bonds in the sketch.
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