A student makes three statements about some ionic compounds.
Statement 1: CaS\mathrm{CaS}CaS is calcium sulfide
Statement 2: LiNO3\mathrm{LiNO_{3}}LiNO3 is lithium nitride
Statement 3: one formula unit of (NH4)2SO4\mathrm{(NH_{4})_{2}SO_{4}}(NH4)2SO4 contains 15 atoms
Which statements are correct?
1 only
1 and 2 only
1 and 3 only
2 and 3 only
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.