Answer
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In the localized electron model, the CO3^2- ion can be described as having three equivalent CO σ bonds, each formed by carbon donating two electrons to oxygen, and three localized π bonds, each formed by the unpaired electrons on oxygen.
In the molecular orbital model, the CO3^2- ion has three σ bonding MOs and three π antibonding MOs. The molecular orbital model describes the p bonding in this species as delocalized π bonding, where the three π electrons are spread out over the entire molecule.
