The oxide of metal M has a giant ionic lattice. In the lattice, each M ion has 6 oxide ions, O2−\mathrm{O^{2-}}O2−, as its nearest neighbours, and each oxide ion has 4 M ions as its nearest neighbours.
Deduce the charge on the ion of metal M. Show your working.
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.