Answer
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In the localized electron model, the O3 molecule can be described as having a double bond between the oxygen atoms, with each oxygen atom donating two electrons to form the σ bond, and the remaining two electrons form a π bond. The NO2^2- ion is described as having one σ bond and one π bond between the nitrogen and oxygen atoms.
In the molecular orbital model, O3 has one σ bonding MO and one π antibonding MO, while NO2^2- has one σ bonding MO and one π bonding MO. The molecular orbital model describes the p bonding in these species as a result of the combination of atomic orbitals, leading to delocalized π bonding.
