Among the following species N _ 2 , N _ 2 ^ + , N _ 2 ^ - , N _ 2 ^...

The molecules with unpaired electrons are paramagnetic and molecules with all electrons paired are diamagnetic. In general molecules with an even number of electrons (except $10$ and $16$ electrons) are diamagnetic

$\begin{cases}{N}_{2} & 14{e}^{-}\end{cases}diamagnetic$

$\begin{cases}{N}_{2}^{+} & 13{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{N}_{2}^{-} & 15{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{N}_{2}^{2 -} & 16{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{O}_{2} & 16{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{O}_{2}^{+} & 15{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{O}_{2}^{-} & 17{e}^{-}\end{cases}paramagnetic$

$\begin{cases}{O}_{2}^{2 -} & 18{e}^{-}\end{cases}diamagnetic$