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Following the transition elements and once crossing Zinc, (IE)₁ drops abruptly in Ga, In or TI. This is due to

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increases in atomic radius leads to high attraction between the electron and nucleus.

None of the above is correct

decrease in atomic size

removal of an electron from the singly occupied np-orbitals of higher energy than the ns-orbitals of Zn, Cd and Hg.

answer is C.

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Detailed Solution

$\begin{aligned} Ga (31) = [Ar]_{18} 4 s^{2} 3 d^{10} 4 p^{1} ⟵ easier to remove \\ Zn (30) = [Ar]_{18} 4 s^{2} 3 d^{10} ⟵ difficult to remove \end{aligned}$
Similar case of In /Cd and TI/ Hg.

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