A-LevelChemistryChemical periodicityFeb/Mar 2025Paper 1 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?

Q: What is the correct answer to this A-Level Chemistry question?

The correct answer is C: fluorine chlorine.

Q: What topic does this question test?

This question tests Chemical periodicity in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Aargon neon

Bchlorine fluorine

Cfluorine chlorine

Dneon argon

✓ Correct Answer

The correct answer is C: fluorine chlorine

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Chemistry Question

Topic

This multiple-choice question tests Chemical periodicity in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2025 examination, Paper 1 Variant 2.

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