(a)[3]
Draw a sketch to show how the atomic radius of the element changes from Na to Cl and explain the pattern.
(b)[4]
Draw a sketch to show how the melting point of the element changes from Na to Cl and explain the pattern.
(c)[4]
Draw a sketch to show how the electrical conductivity of the element changes from Na to Cl and explain the pattern.
(d(i))[3]
The melting points of some oxides of the elements sodium to sulfur are given below. What type of bond is broken when each of the following compounds is melted? $\text{Na}_2\text{O}$ $\text{SiO}_2$ $\text{P}_4\text{O}_6$
(d(ii))[1]
Identify one of these six oxides that shows no reaction with water.