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A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2025 · Q31 Mark

X and Y are elements from the same group of the Periodic Table. The 5th to 9th ionisation energies for X and Y are shown. ionisation energy/kJmol⁻¹ 5th 6th 7th 8th 9th element X 11020 15160 17870 92040 106437 element Y 6540 9360 11020 33360 38600 Which row identifies elements X and Y?

Aargon neon
Bchlorine fluorine
Cfluorine chlorine
Dneon argon

✓ Correct answer

C: fluorine chlorine

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About this question

Topic
Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source
A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 3.

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