A student makes a model of part of an ionic lattice containing ions P+ and N-.
The table records the positions of seven ions in the model.
| Label | Position | Ion |
|---|---|---|
| A | Reference position | P+ |
| B | Immediately left of A | N- |
| C | Immediately right of A | N- |
| D | Immediately in front of A | N- |
| E | Immediately behind A | N- |
| F | Immediately above A | P+ |
| G | Immediately above B | N- |
Two of the labelled ions should exchange positions.
Give the labels of the two ions that should exchange positions.
Explain why exchanging these ions gives a better model of the structure and bonding in an ionic compound.
98 exam-style questions on AQA GCSE Chemistry 2.1 Chemical bonds, ionic, covalent and metallic, covering 2.1.1 Chemical bonds, 2.1.2 Ionic bonding, 2.1.3 Ionic compounds, 2.1.4 Covalent bonding, and 2.1.5 Metallic bonding. Each one has a worked solution and a mark scheme showing where the marks go.