NEET2018Chemistry-Periodic Table
NEET 2018 Chemistry Trends in Periodic Table MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The CORRECT order of atomic radii in group 13 elements is __________.
A
B < Al < In < Ga < Tl
B
B < Al < Ga < In < Tl
C
B < Ga < Al < Tl < In
D
B < Ga < Al < In < Tl
Correct Answer
Option D
Detailed Explanation
In group 13, the atomic radii generally increase down the group. However, Ga is smaller than Al due to the presence of d-electrons in Ga, which do not shield the nuclear charge effectively.
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