AIPMT PRELIMS2010Chemistry-Periodic Table
AIPMT PRELIMS 2010 Chemistry Trends in Ionic Radii MCQ Question
Type: MCQ-conceptual-Medium-Class 11
The correct order of the decreasing ionic radii among the following isoelectronic species is
A
K⁺ > Ca²⁺ > Cl⁻ > S²⁻
B
Ca²⁺ > K⁺ > S²⁻ > Cl⁻
C
Cl⁻ > S²⁻ > Ca²⁺ > K⁺
D
S²⁻ > Cl⁻ > K⁺ > Ca²⁺
Correct Answer
Option D
Detailed Explanation
Among isoelectronic species, ionic radii increases with increase in negative charge as Z_eff decreases and ionic radii decreases with increase in positive charge as Z_eff increases.
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