The figure shows part of the structure of diamond.
Figure: Part of the giant covalent structure of diamond

Use the figure to describe the structure of diamond.
Explain why diamond is very hard.
68 exam-style questions on AQA GCSE Chemistry 2.3 Structure and bonding of carbon, covering 2.3.1 Diamond, 2.3.2 Graphite, and 2.3.3 Graphene and fullerenes. Each one has a worked solution and a mark scheme showing where the marks go.