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.
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)
Write resonance forms that describe the distribution of electrons in each of these molecules or ions.
carbonate ion, CO32−
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Resonance Structures concept. You can view video lessons to learn Resonance Structures. Or if you need more Resonance Structures practice, you can also practice Resonance Structures practice problems.