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Question
Chemistry
The reason behind the lower atomic radius of Ga as compared to Al is
Q. The reason behind the lower atomic radius of
G
a
as compared to
A
l
is
2007
217
The p-Block Elements
Report Error
A
poor screening effect of
d
-electrons for the outer electrons from increased nuclear charge
92%
B
increased force of attraction of increased nuclear charge on electrons
4%
C
increased ionisation enthalpy of
G
a
as compared to
A
l
3%
D
anomalous behaviour of
G
a
1%
Solution:
Presence of
10
d
-electrons in gallium which have poor screening effect on the outer electrons increases the force of attraction between the outermost electrons and nuclear charge resulting in decrease in atomic radius.