Lewis structure of H2CO

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Step method to draw lewis structure

Step 1: Find valence e- for all atoms. Add them together.

H:1x2=2
C:4
O:6

Total=12

Step2: Find octet e- for each atom and add them together.

H:2x2=4
C=8
O=8

Total=20

Step3: Gives you bonding e-. Subtract step 1 total from step 2

20-12=8e-

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

8e-/2= 4 bond pairs

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

12-8= 4e-=2 lone pair

Use information from step 4 and 5 to draw the lewis structure.

Carbon  goes in the centre.Make sure carbon and oxygen get 8 electrons to fulfil octet rule.


H2Co lewis structure

Lewis dot structure of H2CO

Alternatively a dot method can be used to draw the lewis structure.
Calculate the total valence electrons in the molecule.
H:1x2=2
C:4
O:6

Total=12

Put carbon in the center and arrange hydrogen and oxygen atoms on the sides.Arrange electrons until both carbon and oxygen get 8 electrons.( hydrogen octet state is 2)

H2Co lewis dot structure