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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.

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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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