1.

Following the transition elements, (IE)1 drops abruptly in Ga, In and Tl. This is due to :- 1. Decrease in effective nuclear charge. 2. Increases in atomic radius. 3. Removal of an electron from the singly occupied np orbitals of higher energy than the ns-orbitals of Zn, Cd and Hg. 4. None is correct. ​​​​With explanation.

Answer» Following the transition elements, (IE)1 drops abruptly in Ga, In and Tl. This is due to :-
1. Decrease in effective nuclear charge.
2. Increases in atomic radius.
3. Removal of an electron from the singly occupied np orbitals of higher energy than the ns-orbitals of Zn, Cd and Hg.
4. None is correct.
​​​​With explanation.


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