\begin{tabular}{|c|c|c|c|} \hline \multicolumn{3}{|c|}{ Some ionic compounds } \\ \hline cation & anion & empirical formula & name of compound \\ \hline Na+ & Ci & & \\ \hline Na+ & I & & \\ \hline Na+ & F & & \\ \hline Na+ & Br & & \\ \hline \end{tabular}