A-LevelChemistryAtomic structureOct/Nov 2011Paper 1 Q191 Mark
Ar, Ca²⁺ and K⁺, contain the same number of electrons. In which order do their radii increase?
Asmallest radius: Ar, K⁺, Ca²⁺: largest radius
Bsmallest radius: Ca²⁺, Ar, K⁺: largest radius
Csmallest radius: Ca²⁺, K⁺, Ar: largest radius
Dsmallest radius: K⁺, Ar, Ca²⁺: largest radius
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The correct answer is C. This question tests the candidate's understanding of atomic structure within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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