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(D) The total number of electrons in $O_2^{2-}$ is $8 + 8 + 2 = 18$.The molecular orbital configuration is:$(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s

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$10, 8$

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(D) The total number of electrons in $O_2^{2-}$ is $8 + 8 + 2 = 18$.The molecular orbital configuration is:$(\sigma 1s)^2, (\sigma^* 1s)^2, (\sigma 2s)^2, (\sigma^* 2s)^2, (\sigma 2p_z)^2, (\pi 2p_x)^2, (\pi 2p_y)^2, (\pi^* 2p_x)^2, (\pi^* 2p_y)^2$Bonding electrons $(N_b)$ = $2 (\sigma 1s) + 2 (\sigma 2s) + 2 (\sigma 2p_z) + 2 (\pi 2p_x) + 2 (\pi 2p_y) = 10$Antibonding electrons $(N_a)$ = $2 (\sigma^* 1s) + 2 (\sigma^* 2s) + 2 (\pi^* 2p_x) + 2 (\pi^* 2p_y) = 8$Therefore,the number of electrons in bonding and antibonding orbitals is $10$ and $8$ respectively.

The number of electrons present in bonding and antibonding orbitals in $O_2^{2-}$ is respectively

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