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

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(A) The electronic configuration of $O_2$ is $KK \sigma(2s)^2 \sigma^*(2s)^2 \sigma(2p_z)^2 \pi(2p_x)^2 \pi(2p_y)^2 \pi^*(2p_x)^1 \pi^*(2p_y)^1$.When

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$\pi ^*$ orbital

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(A) The electronic configuration of $O_2$ is $KK \sigma(2s)^2 \sigma^*(2s)^2 \sigma(2p_z)^2 \pi(2p_x)^2 \pi(2p_y)^2 \pi^*(2p_x)^1 \pi^*(2p_y)^1$.When $O_2$ gains an electron to form $O_2^-$,the incoming electron enters the next available orbital,which is the antibonding $\pi^*$ orbital.Thus,the configuration of $O_2^-$ becomes $KK \sigma(2s)^2 \sigma^*(2s)^2 \sigma(2p_z)^2 \pi(2p_x)^2 \pi(2p_y)^2 \pi^*(2p_x)^2 \pi^*(2p_y)^1$.

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

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