(a)[1]
Explain in what way metals conduct electricity.
(b)[2]
State two patterns in the properties of the alkali metals.
(c)[2]
Name the products made when rubidium reacts with water.
(d)[1]
Titanium is obtained from titanium(IV) chloride by reduction using molten sodium. TiCl$_4$ + 4Na $\rightarrow$ 4NaCl + Ti Suggest why sodium reduces titanium(IV) chloride.