A-LevelChemistryChemical periodicityMay/June 2023Paper 1 Q171 Mark
L, M and N are three different elements from Period 3 of the Periodic Table. L is the element whose atoms have three unpaired electrons in its 3p sub-shell. M is the element with the highest electrical conductivity in the period. N is the element with the highest melting point in the period. Which statement about element L is correct?
AL has a higher atomic number than M and a lower atomic number than N.
BL has a lower atomic number than M and a higher atomic number than N.
CL has a lower atomic number than both M and N.
DL has a higher atomic number than both M and N.
✓ Correct Answer
The correct answer is D: L has a higher atomic number than both M and N.
📋 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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