Figure: Incomplete dot-and-cross diagram for magnesium oxide

Which electron transfer completes the diagram?
One electron from oxygen to magnesium
Two electrons from oxygen to magnesium
One electron from magnesium to oxygen
Two electrons from magnesium to oxygen
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.