Calcium is in group 2 and fluorine is in group 7. Calcium and fluorine form an ionic compound.
Deduce the formula of the compound and explain how electron transfer between the atoms leads to the ratio of ions in the formula.
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.