A methane molecule, CH4\mathrm{CH_{4}}CH4, can be shown as a dot and cross diagram or as a ball and stick model.
Which information is shown by the dot and cross diagram but not by the ball and stick model?
That each covalent bond is a pair of electrons, one from each atom
Which atoms are bonded to each other
The relative sizes of the atoms
The 3D shape of the molecule
64 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.