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Chemistry · May / June 2025 · Paper 12 · Question 23

5070Group I properties

Rubidium and caesium are both elements in Group I of the Periodic Table. Which prediction comparing rubidium and caesium is correct?

  1. ACaesium has the higher density and the greater reactivity.
  2. BCaesium has the higher density; rubidium has the greater reactivity.
  3. CRubidium has the higher density and the greater reactivity.
  4. DRubidium has the higher density; caesium has the greater reactivity.

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Correct answer: A. Caesium has the higher density and the greater reactivity.

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