An ionic compound contains positive ions represented by M\mathrm{M}M and nitrate ions, NO3−\mathrm{NO_{3}^{-}}NO3−. The compound is electrically neutral.
A student builds a model of part of the lattice of this compound. The table shows the numbers of particles in the model.
| particle | number |
|---|---|
| M\mathrm{M}M ions | 8 |
| oxygen atoms within nitrate ions | 72 |
Calculate the charge on each M\mathrm{M}M ion and give the formula of the compound.
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.