Some elements in Group 7 of the periodic table are shown in the table below:
| Group 7 element | Atomic number | Relative atomic mass |
|---|---|---|
| fluorine | 9 | 19 |
| chlorine | 17 | 35.5 |
| bromine | 35 | 80 |
| iodine | 53 | 127 |
Explain, in terms of their electronic configurations, why these elements are placed in Group 7 of the periodic table.
80 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.