During change of $\mathrm{O}_2$ to $\mathrm{O}_2^{-}$ion, the electron adds on which one of the following orbitals?

Question

Aicharya · Accepted Answer

Electronic configuration of $\mathrm{O}_2$ $\begin{aligned} & \sigma(1 s)^2 \sigma^*(1 s)^2 \sigma(2 s)^2 \sigma^*(2 s)^2 \sigma\left(2 p_z\right)^2 \pi\left(2 p_x\right)^2=\pi\left(2 p_y\right)^2 \ & \pi^*\left(2 p_x\right)^1=\pi^*\left(2 p_y\right)^1 \end{aligned}$ Thus, the incoming electron will enter in $\pi^* 2 p_x$ to form $\mathrm{O}_2$.

During change of $\mathrm{O}_2$ to $\mathrm{O}_2^{-}$ion, the electron adds on which one of the following…

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