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Edexcel IGCSE Chemistry 2.8C Group 7 electronic configurations

Practise Group 7 electron-structure questions by comparing configurations and explaining why bromine is less reactive than chlorine.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Compare Group 7 configurations such as fluorine 2.7 and chlorine 2.8.7.
  • Link extra shells to weaker nuclear attraction for a gained electron down the group.

2.8C Group 7 electronic configurations question 1

[Maximum number: 3]

This question is about elements in Group 7 and their compounds.
The table gives information about some of these elements.

Table for Question 2.8C Group 7 electronic configurations question 1 — Edexcel IGCSE Chemistry

Sea water contains bromide ions.

Bromine can be obtained by bubbling chlorine through a sample of sea water.
The ionic equation for the reaction is

Cl2( g)+2Br−(aq)→2Cl−(aq)+Br2(aq)\mathrm{Cl}_{2}(\mathrm{~g})+2 \mathrm{Br}^{-}(\mathrm{aq}) \rightarrow 2 \mathrm{Cl}^{-}(\mathrm{aq})+\mathrm{Br}_{2}(\mathrm{aq})

The reaction occurs because chlorine is more reactive than bromine.

Bromine is below chlorine in Group 7.
Explain the decrease in reactivity from chlorine to bromine.

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