Element P is in group 1 and element Q is in group 6 of the periodic table.
P and Q form a solid ionic compound. A sample of the compound contains 7.2 × 1020 ions in total.
Calculate the number of P ions and the number of Q ions in the sample.
Explain why the sample has no overall charge. Use the numbers of ions in your answer.
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.