A-LevelChemistryChemical periodicityMay/June 2016Paper 1 Q31 Mark
Elements X and Y are in the same group of the Periodic Table. The table shows the first six ionisation energies of X and Y in kJ mol¯¹. 1st: X 800, Y 1000 2nd: X 1600, Y 1800 3rd: X 2400, Y 2700 4th: X 4300, Y 4800 5th: X 5400, Y 6000 6th: X 10400, Y 12300 What could be the identities of X and Y?
Aantimony, Sb arsenic, As
Barsenic, As antimony, Sb
Cselenium, Se tellurium, Te
Dtellurium, Te selenium, Se
✓ Correct Answer
The correct answer is A: antimony, Sb arsenic, As
📋 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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