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The electropositive character increases from B to Al and then decreases from Al to Tl because of

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Decrease in the ionization energy of the elements

Decrease in the electronegativity of the elements

Increase in the size of the elements

Ineffective shielding of the nuclear charge by d-electrons in the case of Ga, ln and Tl

answer is D.

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The electropositive character increases from B to Al and then decreases from Al to Tl because of Ineffective shielding of the nuclear charge by d-electrons in the case of Ga, ln and Tl

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