Which formula is correct for aluminium chloride?
AlCl3\mathrm{AlCl_{3}}AlCl3
AlCl2\mathrm{AlCl_{2}}AlCl2
AlCl\mathrm{AlCl}AlCl
Al2Cl3\mathrm{Al_{2}Cl_{3}}Al2Cl3
119 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.