Question

According to molecular orbital theory, the number of unpair electrons(s) in$O_2^{2-}$ is

Answer 1

Electro configuration of $O_2^{2-}$ (according to MOT) is
$\sigma 1s^2,{\sigma }^{\ast }1s^2,\sigma 2s^2,{\sigma }^{\ast }2s^2,\sigma 2p_z^2,\pi 2p_x^2=\pi 2p_y^2,{\pi }^{\ast }2p_x^2={\pi }^{\ast }2p_y^2$
Total unpaired electrons in $O_2^{2-}$ is zero.