How many of the following molecules ions are paramagnetic in nature?
\[
\mathrm{N_2,\ O_2,\ F_2,\ NO,\ CO,\ O_2^-,\ O_2^{2-},\ N_2^+,\ NO^+,\ NO^-,\ H_2}
\]
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A molecule is
\[
\boxed{\text{Paramagnetic}}
\]
if it contains one or more unpaired electrons in its molecular orbitals; otherwise, it is
\[
\boxed{\text{Diamagnetic}.}
\]