The Lewis structure for polyatomic carbonate anion would be two oxygen atoms bonded with carbon atom with a single bond and one double bond is present.
There are three σ bonds and π bond around carbon atom in the Lewis structure of CO3^2- ion. According to the question caron has 4 valanced electrons. There are three oxygen atoms in CO32- ion,
Therefore,
Total valence electrons given by oxygen atoms = 6 *3 = 18
There are -2 charge on CO32- ion. Therefore, there are two more electrons which contribute to the valence electrons.
Total valence electrons = 4 + 18 + 2 = 24
Carbon has the more chance to be the center atom because carbon can show valance of 4. Oxygen's highest valence is 2. So, now we can build a sketch of CO3^2- ion.
Learn more about valence electrons at,
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