Which limitation applies to a 2-D diagram of the sodium chloride lattice but does not apply to a 3-D ball-and-stick model of it?
It suggests each ion has four oppositely charged neighbours instead of six
It shows only a small part of a lattice that continues in every direction
It shows the ions much further apart than they are in a real crystal
It does not show that the ions vibrate about their fixed positions
48 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.