Question

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

Answer 1

Answer: 0

Molecular orbital configuration of $O_2^{2-}$ is
${\sigma }_{1s}^2{\sigma }_{1s}^{\ast 2}{\sigma }_{2s}^2{\sigma }_{2s}^{\ast 2}\left(\pi 2p_x^2=\pi 2p_y^2\right)\left({\pi }_{2px}^{\ast 2}={\pi }_{2py}^{\ast 2}\right)$
Zero unpaired electron