(a(i))[2]
Use this information to determine the physical state of fluorine at room temperature and to estimate the boiling point of chlorine.
(a(ii))[1]
Explain why chlorine has a density that is much smaller than the densities of bromine and iodine.
(b(i))[1]
Why is chlorine put into water?
(b(ii))[1]
State one important industrial use of water.
(c)[2]
Balance this chemical equation: $\ldots\text{P} + \ldots\text{Cl}_2 \rightarrow 2\text{PCl}_3$.
(d)[2]
Complete the dot-and-cross diagram to show the electron arrangement in one chlorine molecule. Show only outer-shell electrons.