Frequently Examined
Group 7 is one of the most regularly examined topics in GCSE Chemistry. Key question types include: describing the physical properties (colour, state) of halogens (2-3 marks); explaining the reactivity trend in Group 7 (3 marks); writing equations for displacement reactions and describing observations (3-4 marks); and comparing Group 7 with Group 1 reactivity trends (4 marks). Displacement reactions with colour changes are a favourite practical-based question.
Edexcel 1CH0: Examined in Paper 1 (1CH0/1). Edexcel tests halogen displacement reactions frequently — students must describe colour changes and write ionic equations. Explaining why reactivity decreases down Group 7 (using electron gain and nuclear attraction) is a standard 3-mark question. In Edexcel-style questions, the command word "Suggest" appears frequently — use your chemistry knowledge to apply to an unfamiliar context.
This exam focus covers Exam Focus within Group 7: Halogens for GCSE Chemistry. Revise Group 7: Halogens in Atomic Structure for GCSE Chemistry with 22 exam-style questions and 21 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 10 of 12 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Group 7: Halogens
How many electrons do halogens have in their outer shell?
Explain why chlorine is more reactive than bromine.