\[
\begin{array}{|c|c|c|c|}
\hline \text{cation} & \text{anion} & \text{empirical formula} & \text{name of compound} \\
\hline \mathrm{Zn}^{2+} & \mathrm{NO}_{2}^{-} & \boxed{\mathrm{Zn}(\mathrm{NO}_{2})_{2}} & \boxed{\text{Zinc nitrite}} \\
\hline \mathrm{Cu}^{2+} & \mathrm{ClO}^{-} & \boxed{\mathrm{Cu}(\mathrm{ClO})_{2}} & \boxed{\text{Copper(I) hypochlorite}} \\
\hline \mathrm{Pb}^{2+} & \mathrm{SO}_{3}^{2-} & \boxed{\mathrm{PbSO}_{3}} & \boxed{\text{Lead(II) sulfite}} \\
\hline \mathrm{Ba}^{2+} & \mathrm{IO}_{2}^{-} & \boxed{\mathrm{Ba}(\mathrm{IO}_{2})_{2}} & \boxed{\text{Barium iodite}} \\
\hline
\end{array}
\]