# Simple procedure for writing lewis structures

Lewis structure of NO2- ion is drawn in this tutorial. Total valence electrons of nitrogen và oxygene atoms và negative charge also should be considered in the drawing of NO2- lewis structure.

Bạn đang xem: Simple procedure for writing lewis structures Now, we are going to learn, how khổng lồ draw this lewis structure.

## Steps of drawing NO2- lewis structure

Following steps are required to lớn draw NO2- lewis structure và they are explained in detail in this tutorial.

Find total number of electrons of the valance shells
of nitrogen và oxyren atoms and charge of the anion Total electrons pairs Center atom selection from nitrogene and oxygene atom Put lone pairs on atoms Stability of lewis structure - Chechồng the stability và minimize charges on atoms by converting lone pairs to lớn bonds.

Drawing correct lewis structure is important to lớn draw resonance structures.

### Total number of electrons of the valance shells of nitrogen và oxygen atoms and charge of the anion

There are one nitrogene atom and two oxygene atoms in the nitrate ion. Also there is a -1 charge.

Nitrogen & oxyren are located at VA and VIA groups respectively in the periodic table. So nitroren has five electrons in its valence shell. In oxyren atom, there are six electrons in its valence shell.

Total valence electrons given by nitrogen atom = 5

There are two oxygene atoms in NO2, Therefore

Total valence electrons given by oxyren atoms = 6 *2 = 12

Due to lớn -1 charge, another electrons is added

Due to -1 charge, received electrons = 1
Total valence electrons = 5 + 12 + 1 = 18

### Total valence electrons pairs

Total valance electrons pairs = σ bonds + π bonds + lone pairs at valence shells

Total electron pairs are determined by dividing the number total valence electrons by two. For, NO2-, there are 18 valence electrons pairs, so total pairs of electrons are 9.

### Center atom of NO2-

To be the center atom, ability of having greater valance is important. Therefore nitroren has the more chance lớn be the center atom (See the figure). So, now we can build a sketch of NO2- ion. ### Lone pairs on atoms

There are already two N-O bonds in the sketch. Therefore only seven valence electrons pairs are remaining.

Start lớn mark those seven valence electrons pairs on outside atoms (oxygen atoms) as lone pairs. One oxyren atom will take three lone pairs following the octal rule (oxyren và nitrogen atoms cannot keep more than eight electrons in their valence shells).

Two oxygene atoms will take six valence electrons pairs. Now one valence electrons pair is remaining. Mark that remaining one on nitroren atom. ### Check the stability of drawn NO2- ion and minimize charges on atoms by converting lone pairs khổng lồ bonds

The drawn structure for NO2- is not a stable one because both oxygene atoms và nitrogene 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 oxygene atom as a N-H bond.

Now there is a double bond between nitroren and one oxyren atom. There is a single bond also with nitrogene atom and other oxygene atom. In new structure, charges of atoms reduced. Now there is no any charge on one oxygen atom and nitrogene atom. Now you understand this structure of NO2- 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 nitrogene cannot keep more than eight electrons in its last valence shell.

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