Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Ionization enthalpy 
for the elements of Group 13 follows the order.
A
B 
Al 
Ga 
In 
Tl
Al Ga In Tl
B
In 
C
D
In 
Text Solution
Verified by ExpertsThe correct answer is:
D
In 
On moving down the group, ionization energy decreases. The
observed discontinuity in the ionization energy values between Al and Ga , and between In and Tl are due to inability of 
- and 
-electrons to compensate the increase in ion nuclear charge.
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