STANDARDChemistry-Periodic Table
STANDARD Chemistry Atomic and Ionic Radii MCQ Question
Type: MCQ-conceptual-Medium
Identify the correct order of the size of the following
A
Ca²⁺ < K⁺ < Ar < S²⁻ < Cl⁻
B
Ca²⁺ < K⁺ < Ar < Cl⁻ < S²⁻
C
Ar < Ca²⁺ < K⁺ < Cl⁻ < S²⁻
D
Ca²⁺ < Ar < K⁺ < Cl⁻ < S²⁻
Correct Answer
Option B
Detailed Explanation
Among isoelectronic ions, ionic radii of anions is more than that of cations. Further size of the anion increases with an increase in negative charge and the size of the cation decreases with an increase in positive charge. This is due to the increase in effective nuclear charge in case of cation and due to the decrease in effective nuclear charge in the case of the anion. Note: Cation < Neutral atom < Anion.
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