Solved: Based on your knowledge of the chemistry of the

Step 1 of 2

Group 1A elements are called alkali metals. The electronic configuration of 1A elements is as follows;

\(\begin{array}{|c|c|c|} \hline \text { Group 1A } & & \\ \hline \mathrm{Li} & 1 s^{2} 2 s^{1} & {[\mathrm{He}] 2 s^{1}} \\ \hline \mathrm{Na} & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} & {[\mathrm{Ne}] 3 s^{1}} \\ \hline \mathrm{K} & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} & {[\mathrm{Ar}] 4 s^{1}} \\ \hline \mathrm{Rb} & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{1} & {[\mathrm{Kr}] 5 s^{1}} \\ \hline \mathrm{Cs} & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6} 6 s^{1} & {[\mathrm{Xe}] 6 s^{1}} \\ \hline \mathrm{Fr} & 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6} 6 s^{2} 4 f^{14} 5 d^{10} 6 p^{6} 7 s^{1} & {[\mathrm{Rn}] 7 s^{1}} \\ \hline \end{array}\)