A-LevelChemistryAtomic structure9701/12 · Oct/Nov 2011 · 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
✓ Correct answer
C: smallest radius: Ca²⁺, K⁺, Ar: largest radius
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