(a)[3]
Complete the table to show how many unpaired electrons are present in the outer shell of each gaseous atom from $\text{Na}$ to $\text{Ar}$.
(b(i))[3]
Complete the table for the reactions of two Period $3$ chlorides with water, giving the observations and the pH of the solution formed for $\text{SiCl}_4$ and $\text{PCl}_5$.
(b(ii))[1]
Write the equation for the reaction of $\text{SiCl}_4$ with $\text{H}_2\text{O}$.