Published by:
CGP EDU Academic Team
Published on: August 13, 2026
First IE of 
series elements are higher than those of 
and 
series elements. This is due to
A
bigger size of atoms of 
-series elements than 
-series elements. and
-series elements than -series elements. and
B
greater effective nuclear charge is experienced by valence electrons because of the weak shielding effect of the 
- electrons in 
series. both
- electrons in series. both
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
NOT AVAILABLE
The order of shielding effect of various orbital electrons is 
. due to the poor shielding effect of 
electrons in 
series elements, there is increase in effective nuclear charge. As a result of this the valence electrons are tightly bound with the nucleus and thus their removal require higher energy.
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