The table below shows some of the elements in Group 7 of the periodic table.
| 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 all placed in Group 7 of the periodic table.
Practise Edexcel GCSE Chemistry Group 7 with exam-style questions for Foundation and Higher tier. 87 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.