The ans is given as 4 but shldnt it be 8

Dear Student,

$$\begin{gathered} \mathrm{Molecular} \mathrm{orbital} \mathrm{configuration} \mathrm{of} {{\mathrm{O}}_2}^{2-} \mathrm{is} : \\ \left(\mathrm{\sigma }1\mathrm{s}{)}^2\right(\mathrm{\sigma }*1\mathrm{s}{)}^2\left(\mathrm{\sigma }2\mathrm{s}{)}^2\right(\mathrm{\sigma }*2\mathrm{s}{)}^2(\mathrm{\sigma }2{\mathrm{p}}_{\mathrm{z}}{)}^2\left\{\begin{array}{l}(\mathrm{\pi }2{\mathrm{p}}_{\mathrm{x}}{)}^2\\ (\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}{)}^2\end{array}\right.\left\{\begin{array}{l}(\mathrm{\pi }*2{\mathrm{p}}_{\mathrm{x}}{)}^2\\ (\mathrm{\pi }2{\mathrm{p}}_{\mathrm{y}}{)}^2\end{array}\right. \end{gathered}$$

It does not have any electrons in f^* anti bonding orbitals.

Regards