(a(i))[1]
State how the atomic radius changes from silicon to sulfur.
(a(ii))[3]
Silicon melts at $1410^\circ\text{C}$, whereas sulfur melts at $113^\circ\text{C}$. Explain why.
(b(i))[2]
Fill in Table 1.1 to display the total numbers of $s$ and $p$ electrons in an atom of Si, P and S.
(b(ii))[1]
Write an equation for the first ionisation energy of Si.
(b(iii))[4]
The first ionisation energy of P could be $619\ \text{kJ mol}^{-1}$, $893\ \text{kJ mol}^{-1}$ or $1060\ \text{kJ mol}^{-1}$. Circle the correct one. Explain your choice, and compare it with the values for Si and S.
(b(iv))[1]
$\text{SiCl}_4$ and $\text{PCl}_5$ each react with water and produce misty fumes. Identify the chemical responsible for the misty fumes.
(b(v))[1]
Predict the shape for the $\text{SCl}_2$ molecule.