Electropositive character for the elements of group 13 follows the order ?

B > Al > Ga > In > Tl

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B < Al < Ga < In < Tl

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B < AL > Ga < In > Tl

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B < Al > Ga > In > Tl

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Solution

The correct option is D B < Al > Ga > In > Tl
Answer:- (D) $B < A l > G a > I n > T l$
Reason:-
The electropositive character of elements increases from boron to aluminium due to smaller size and high ionisation potential of B than Al.
However, the electropositive character decreases slowly from Gallium to Thallium due to extra d-electrons which exerts a very little shielding effect on outer electrons. Therefore, these electrons are more firmly held by the nucleus and hence there is a decrease in electropositive character.
Hence, (D) is correct answer.

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B > T l > I n > G a > A l

T l > I n > G a > B > A l

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