NEET2015Chemistry-Periodic Table
NEET 2015 Chemistry Trends in Ionic Radii MCQ Question
Type: MCQ-conceptual-Medium-Class 11
The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?
A
Ar < K⁺ < Ca²⁺
B
Ca²⁺ < Ar < K⁺
C
Ca²⁺ < K⁺ < Ar
D
K⁺ < Ar < Ca²⁺
Correct Answer
Option B
Detailed Explanation
The ionic radius decreases with increasing positive charge. Ca²⁺ has the smallest radius, followed by K⁺, and Ar has the largest.
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