The table shows the number of electrons in the outer shell of four atoms.
| Atom | Number of electrons in the outer shell |
|---|---|
| W | 6 |
| X | 1 |
| Y | 6 |
| Z | 7 |
Which pair of atoms should be placed in the same group of the periodic table?
Atoms W and X
Atoms X and Z
Atoms W and Y
Atoms Y and Z
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.