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Q.

Atomic radius of Ga (135 pm) is less than that of Al (143 pm) because

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a

of the small variation in the inner core of the electronic configuration

b

the presence of additional 10d electrons which offers only poor screening effect for the outer electrons from the increased nuclear charge in gallium

c

Both (a) and (b) are true

d

Neither (a) nor (b) is true

answer is B.

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Detailed Solution

The atomic radius of Ga is less than that of Al because of the variation in the inner core of electronic configuration. The presence of additional I0 d-electrons offer only poor screening effect for the outer electrons from the increased nuclear charge in gallium.
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