He resonance structures of carbon monoxide are shown below. show how each structure can be converted into the other using the curved-arrow notation. to draw an arrow, click on the structure to enter the edit mode, then click on the curved arrow icon.

The two resonating structures of Carbon Monoxide are shown below.
The movement of electrons are shown by arrow.

Structure A:
                  In structure a A the formal charges of Carbon and Oxygen are zero. As Formal Charge is calculated as,

             = # of valence electron - electrons in lone pairs + 1/2 bonding                            electrons electrons

For C:
           = 4 - 2 + 4/2
           = 4- 4
           = 0

For O:
           = 6 - 4 + 4/2
           = 6- 6
           = 0

Structure B:

Formal Charge on C:

           = 4 - 2 + 6/2
           = 4- 5
           = -1

Formal Charge on O:

           = 6 - 2 + 6/2
           = 6 - 5
           = +1

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