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1.2.6Group 7

AQA GCSE Chemistry (8462), Higher tier · Atomic structure and the periodic table › The periodic table

Practise Group 7. 14 exam-style questions on this subtopic, at up to four difficulty levels, with full mark schemes and a progress tracker. Free, no account needed.

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Chlorine, bromine and iodine are Group 7 elements. What name is given to the elements in Group 7?
the halogens
Write the ionic equation for the reaction of chlorine with bromide ions.
Cl2 + 2Br− → 2Cl− + Br2
Iodine reacts with hydrogen to form hydrogen iodide, HI.
Write a balanced symbol equation for this reaction.
H2 + I2 → 2HI
The halogens are the elements in Group 7. Give the charge on a halide ion.
1−
Combine the two half equations to write the ionic equation for the reaction.
Cl2 + 2I− → 2Cl− + I2

Sample questions

Written for this site in the style of AQA exam questions. They are not taken from real past papers.

Question 1Easy5 marks
Chlorine, bromine and iodine are Group 7 elements.
(a) What name is given to the elements in Group 7?[1]
(b) The molecules of Group 7 elements are made of pairs of atoms.
Give the formula of a bromine molecule.[1]
(c) Which Group 7 element is a grey-black solid at room temperature?
Tick (✓) one box.[1]
  • Bromine
  • Chlorine
  • Fluorine
  • Iodine
(d) Sodium reacts with chlorine.
Name the product of the reaction.[1]
(e) How many electrons are in the outer shell of an atom of a Group 7 element?[1]
Show the answer and mark scheme
(a) Answer: the halogens
  • halogens
(b) Answer: Br2
  • Br2
(c) Answer: Iodine
(d) Answer: sodium chloride
  • sodium chloride
(e) Answer: 7
  • 7
Question 2Medium6 marks
Astatine, At, is below iodine in Group 7.
(a) Predict whether astatine would react with sodium iodide solution.
Explain your answer.[2]
(b) Iodine reacts with hydrogen to form hydrogen iodide, HI.
Write a balanced symbol equation for this reaction.[1]
(c) Hydrogen iodide is a covalent compound. Sodium iodide is an ionic compound.
Explain this difference in terms of the elements that react.[2]
(d) Predict the formula of the compound formed when calcium reacts with astatine.[1]
Show the answer and mark scheme
(a) Answer: No reaction, because astatine is less reactive than iodine.
  • no (reaction)
  • astatine is less reactive than iodine (as it is lower in Group 7)
(b) Answer: H2 + I2 → 2HI
  • H2 + I2 → 2HI
(c) Answer: Hydrogen and iodine are both non-metals, so they share electrons; sodium is a metal, so it transfers an electron to iodine and ions form.
  • hydrogen and iodine are both non-metals so they share (pairs of) electrons
  • sodium is a metal so an electron is transferred (from sodium to iodine) / ions are formed
(d) Answer: CaAt2
  • CaAt2
Question 3Hard8 marks
Chlorine displaces bromine from potassium bromide solution.
Cl2 + 2KBr → 2KCl + Br2
(a) Write the ionic equation for the reaction of chlorine with bromide ions.[2]
(b) Complete the half equation for chlorine.
Cl2 + ....e− → ....Cl−[1]
(c) Which species is oxidised in this reaction?
Explain your answer.[2]
(d) Explain why the reactivity of the halogens decreases down Group 7.[3]
Show the answer and mark scheme
(a) Answer: Cl2 + 2Br− → 2Cl− + Br2
  • Cl2 + Br− → Cl− + Br2 (correct species)
  • balanced: Cl2 + 2Br− → 2Cl− + Br2
(b) Answer: Cl2 + 2e− → 2Cl−
  • Cl2 + 2e− → 2Cl−
(c) Answer: Bromide ions, because they lose electrons.
  • bromide ions / Br−
  • (because they) lose electrons
(d) Answer: The atoms get larger, so the outer shell is further from the nucleus; there is weaker attraction for an extra electron, so an electron is gained less easily.
  • atoms get larger / outer shell is further from the nucleus / more shells
  • (so there is) weaker attraction (from the nucleus) for the electron being gained
  • (so) an electron is gained less easily

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