Which of the following is paramagnetic?

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(C) To determine the magnetic behavior,we use Molecular Orbital Theory $(MOT)$: $N_2$ ($14$ electrons): $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \p

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$N_2^+$

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(C) To determine the magnetic behavior,we use Molecular Orbital Theory $(MOT)$: $N_2$ ($14$ electrons): $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2 \sigma(2p_z)^2$. All electrons are paired,so it is diamagnetic. $C_2$ ($12$ electrons): $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2$. All electrons are paired,so it is diamagnetic. $N_2^+$ ($13$ electrons): $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2 \sigma(2p_z)^1$. There is one unpaired electron in the $\sigma(2p_z)$ orbital,so it is paramagnetic. $O_2^{2-}$ ($18$ electrons): $KK \sigma(2s)^2 \sigma^*(2s)^2 \sigma(2p_z)^2 \pi(2p_x)^2 \pi(2p_y)^2 \pi^*(2p_x)^2 \pi^*(2p_y)^2$. All electrons are paired,so it is diamagnetic. Therefore,the correct option is $C$.

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