During the change of O_2 to O_2^- ion,the ele | vedclass

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(C) The molecular orbital configuration of $O_2$ ($16$ electrons) is: $\sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \sigma_{2pz}^

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$\pi ^*$ orbital

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(C) The molecular orbital configuration of $O_2$ ($16$ electrons) is: $\sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \sigma_{2pz}^2, \pi_{2px}^2 = \pi_{2py}^2, \pi_{2px}^{*1} = \pi_{2py}^{*1}$.When $O_2$ changes to $O_2^-$ ($17$ electrons),the additional electron enters the next available orbital,which is the $\pi^*$ antibonding molecular orbital ($\pi_{2px}^*$ or $\pi_{2py}^*$).

During the change of $O_2$ to $O_2^-$ ion,the electron adds to which one of the following orbitals?

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