\begin{tabular}{|l|c|c|c|c|c|} \hline Symbol & 1735Cl & & & & \\ \hline Protons & & 25 & & & 82 \\ \hline Neutrons & & 30 & 66 & & \\ \hline Electrons & & & 49 & 54 & \\ \hline Mass no. & & & & 132 & 207 \\ \hline \end{tabular}