Lewis structure of NH3

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Step method to draw lewis structure of ammonia

Step 1: Find valence e- for all atoms. Add them together. N-5 H-1x3=3 Total=8 Step2: Find octet e- for each atom and add them together.

N-8 H-2x3=6 Total=14

Step3: Gives you bonding e-. Subtract step 1 total from step 2 14-8=6e-

Step 4: Find number of bonds by diving the number in step 3 by 2(because each bond is made of 2 e-) 6e-/2= 3 bond pairs

Step 5: Find the number of nonbonding (lone pairs) e-. Subtract step 3 number from step 1. 8-6= 2e-=1 lone pair

Use information from step 4 and 5 to draw the lewis structure. Nitrogen goes in the centre.NH3 Lewis structure

Lewis dot structure of ammonia

Alternatively a dot method can be used to draw the lewis structure of NH3.
Calculate the total valence electrons in NH3 molecule.
N=5,H=1x3=3
Total=8
Put Nitrogen in the center and three hydrogen atoms on the sides.
Put a pair of electrons connecting the side atom with central atom.Put the fourth pair on the central atom,Nitrogen.

dot structure of NH3