Which of the following has unpaired electron( | vedclass

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(B) The molecular orbital configuration for $O_2^-$ (total $17$ electrons) is: $KK(\sigma 2s)^2(\sigma^* 2s)^2(\sigma 2p_x)^2(\pi 2p_y)^2(\pi 2p_z)^2(

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$O_2^-$

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(B) The molecular orbital configuration for $O_2^-$ (total $17$ electrons) is: $KK(\sigma 2s)^2(\sigma^* 2s)^2(\sigma 2p_x)^2(\pi 2p_y)^2(\pi 2p_z)^2(\pi^* 2p_y)^2(\pi^* 2p_z)^1$.Since there is one unpaired electron in the $\pi^* 2p_z$ orbital,$O_2^-$ is paramagnetic.For $N_2$ ($14$ electrons): $(\sigma 1s)^2(\sigma^* 1s)^2(\sigma 2s)^2(\sigma^* 2s)^2(\pi 2p_y)^2(\pi 2p_z)^2(\sigma 2p_x)^2$ (all paired).For $N_2^{2+}$ ($12$ electrons): $(\sigma 1s)^2(\sigma^* 1s)^2(\sigma 2s)^2(\sigma^* 2s)^2(\pi 2p_y)^2(\pi 2p_z)^2$ (all paired).For $O_2^{2-}$ ($18$ electrons): $(\sigma 1s)^2(\sigma^* 1s)^2(\sigma 2s)^2(\sigma^* 2s)^2(\sigma 2p_x)^2(\pi 2p_y)^2(\pi 2p_z)^2(\pi^* 2p_y)^2(\pi^* 2p_z)^2$ (all paired).

Which of the following has unpaired electron$(s)$?

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