A student builds a model of part of an ionic compound. The model contains two M3+\mathrm{M^{3+}}M3+ ions and two X2−\mathrm{X^{2-}}X2− ions.
Calculate the overall charge on the ions in the model and state how many more X2−\mathrm{X^{2-}}X2− ions are needed to make the overall charge zero.
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.