Which of the following is paramagnetic?

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(C) To determine the magnetic behavior,we calculate the total number of electrons in each species:$1$. $NO^{+}$: $7 + 8 - 1 = 14$ electrons. Configura

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$O_2^{-}$

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(C) To determine the magnetic behavior,we calculate the total number of electrons in each species:$1$. $NO^{+}$: $7 + 8 - 1 = 14$ electrons. Configuration: $(\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\sigma 2p_z)^2$. All electrons are paired,so it is diamagnetic.$2$. $CO$: $6 + 8 = 14$ electrons. Similar to $NO^{+}$,all electrons are paired,so it is diamagnetic.$3$. $O_2^{-}$: $8 + 8 + 1 = 17$ electrons. Configuration: $(\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\sigma 2p_z)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\pi^* 2p_x)^2 (\pi^* 2p_y)^1$. It has one unpaired electron,so it is paramagnetic.$4$. $CN^{-}$: $6 + 7 + 1 = 14$ electrons. Similar to $CO$,all electrons are paired,so it is diamagnetic.Therefore,$O_2^{-}$ is the only paramagnetic species.

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