We are being asked to identify the number of resonance structures for** CO _{3}^{2-}.** We have to follow the steps:

**Step 1**: Determine the central atom in this molecule.

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

**Step 3:** Draw the Lewis Structure for the molecule

**Step 4: **Calculate for formal charges, determine the number of possible structures :

First, we will have to draw the *Lewis Structure *of CO_{3}^{2}

**Step 1: Determine the central atom in this molecule.**

• C → less electronegative atom than O → *central atom*

How many resonance structures are possible for carbonate, CO_{3}^{2–} ?

A. 1 B. 2 C. 3 D. 4 E. 0

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