A chemist compares seven elements. The letters used are not chemical symbols.
| Element | Atomic number | Number of electrons in the outer shell |
|---|---|---|
| A | 3 | 1 |
| B | 9 | 7 |
| C | 10 | 8 |
| D | 11 | 1 |
| E | 17 | 7 |
| F | 18 | 8 |
| G | 19 | 1 |
Use the data to explain why arranging the elements by increasing atomic number produces a periodic pattern.
Predict which two of elements A to F would have chemical properties most similar to element G.
82 exam-style questions on AQA GCSE Chemistry 1.2 The periodic table, covering 1.2.1 The periodic table, 1.2.2 Development of the periodic table, 1.2.3 Metals and non-metals, 1.2.4 Group 0, 1.2.5 Group 1, and 1.2.6 Group 7. Each one has a worked solution and a mark scheme showing where the marks go.