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Chemistry · May / June 2020 · Paper 11 · Question 25

5070Arrangement of elements

Which statement about the properties of some elements is correct?

  1. AAll noble gases are unreactive due to having eight electrons in their outer shells.
  2. BThe Group VII element astatine, At2, is expected to be a black solid at room temperature.
  3. CThe reactivity of the elements in both Group I and Group VII increases down the group.
  4. DWhen aqueous chlorine is added to aqueous potassium bromide there is no change in colour.

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Correct answer: B. The Group VII element astatine, At2, is expected to be a black solid at room temperature.

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