Metal M forms an ionic hydroxide containing OH−\mathrm{OH^{-}}OH− ions. One formula unit of this hydroxide contains 7 atoms in total.
The carbonate ion is CO32−\mathrm{CO_{3}^{2-}}CO32−. What is the formula of the carbonate of M?
MCO3\mathrm{MCO_{3}}MCO3
M2CO3\mathrm{M_{2}CO_{3}}M2CO3
M2(CO3)3\mathrm{M_{2}(CO_{3})_{3}}M2(CO3)3
M3(CO3)2\mathrm{M_{3}(CO_{3})_{2}}M3(CO3)2
56 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.