A-LevelChemistryChemical periodicityFeb/Mar 2017Paper 2 Q117 Marks
(a) The table shows information about some of the elements in the third period. element | Na | Mg | Al | P | S | Cl ---|---|---|---|---|---|--- atomic radius/nm | 0.186 | 0.160 | 0.143 | 0.110 | 0.104 | 0.099 radius of most common ion/nm | 0.095 | 0.065 | 0.050 | 0.212 | 0.184 | 0.181 maximum oxidation number of the element in its compounds | +1 | | | | | +7
📋 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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