Generally the atomic and ionic radii increase with increase in atomic number down the group. But the atomic size of aluminium and gallium is almost the same. This is becauseA. the high nuclear charge of Ga and TlB. the intervening d and f electronsC. high ionization energies of these elementsD. none of these

Generally the atomic and ionic radii increase with increase in atomic

1.	Generally the atomic and ionic radii increase with increase in atomic number down the group. But the atomic size of aluminium and gallium is almost the same. This is becauseA. the high nuclear charge of Ga and TlB. the intervening d and f electronsC. high ionization energies of these elementsD. none of these
Answer» Correct Answer - B Because of ineffective shielding of nuclear charge by d electrons in case of Ga, In and Tl due to which the valence electrons are tightly held.

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