Problem: Write resonance forms that describe the distribution of electrons in each of these molecules or ions. carbonate ion, CO32−

FREE Expert Solution

We are being asked to identify the resonance forms that describe the distribution of electrons in carbonate ion, CO32− ion.

We will have to draw the Lewis Structure of CO32− first.

Step 1: Determine the central atom in this molecule.

• C is less electronegative than O.
• C is the 
central atom and is bonded to the 3 other O atom


Step 2: Calculate the total number of valence electrons present.          

CO32−:

          Group              Valence Electrons

C         4A                    4 valence e x 1
O         6A                    6 valence e- x 3
                                 = 22 valence e

-2 charge                     +2 e­-

 Total = 24 valence e-


Step 3: Draw the Lewis Structure for the molecule

• O and C → prefers to have complete octet (8 e- around them)

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Problem Details

Write resonance forms that describe the distribution of electrons in each of these molecules or ions.

 carbonate ion, CO32−