The electropositive first increases from B to Al and then decreases from Al to Tl own the group because ofA. decrease in ionization energy of the elementsB. increase in size of the elementsC. ineffective shielding of nuclear charge by d-electrons in case of Ga, In and Tl due to which the valence electrons are tightly held and are not lost easily.D. decrease in electronegatively of the elements.

The electropositive first increases from B to Al and then decreases fr

1.	The electropositive first increases from B to Al and then decreases from Al to Tl own the group because ofA. decrease in ionization energy of the elementsB. increase in size of the elementsC. ineffective shielding of nuclear charge by d-electrons in case of Ga, In and Tl due to which the valence electrons are tightly held and are not lost easily.D. decrease in electronegatively of the elements.
Answer» Correct Answer - C

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