A materials researcher studies an ionic compound in a newly made material.
The compound contains only M3+\mathrm{M^{3+}}M3+ ions and sulfate ions, SO42−\mathrm{SO_{4}^{2-}}SO42−.
The researcher claims that one formula unit of the compound contains 14 atoms.
Explain whether the researcher's claim is correct. Include the formula of the compound 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.