Answer
According to molecular-orbital theory, the extra electron in $\mathrm{O}_{3}^{-}$ occupies an antibonding orbital. Correspondingly, the-oxygen-oxygen bonds in $\mathrm{O}_{3}$ is slightly longer than in $\mathrm{O}_{3}$.
Work Step by Step
According to molecular-orbital theory, the extra electron in $\mathrm{O}_{3}^{-}$ occupies an antibonding orbital. Correspondingly, the-oxygen-oxygen bonds in $\mathrm{O}_{3}$ is slightly longer than in $\mathrm{O}_{3}$.
