(a(i))[1]
The table presents some properties of the Group V elements. Use the information in the table to predict the density of antimony.
(a(ii))[1]
Suggest why it is hard to predict the melting point of arsenic.
(b(i))[4]
The structures of two phosphorus compounds, R and S, are shown. Explain in terms of structure and bonding why compound R has a high melting point and compound S has a low melting point.
(b(ii))[1]
Explain why compound R conducts electricity in the molten state.
(b(iii))[1]
Draw a dot-and-cross diagram for one molecule of compound S. Include only the outer-shell electrons.
(c)[2]
A phosphorus oxide has the formula $\text{P}_4\text{O}_{10}$. Calculate the percentage by mass of phosphorus in this compound.