How many total equivalent Lewis structures are needed to describe the carbonate anion, CO₃^2-?

Name: How many total equivalent Lewis structures are needed to describe the carbonate anion, CO 3 2- ?
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The carbonate ion (CO3^2-) has three equivalent resonance structures. These structures are formed by the delocalization of the pi electrons, resulting in three structures where the double bond between the carbon and one of the oxygen atoms shifts among the three oxygen atoms.

How Many Total Equivalent Lewis Structures Are Needed to Describe