JEE Main Chemistry question

**Assertion:** The ionisation energy of gallium remains nearly the same as that of aluminium. **Reason:** This is due to the shielding of the outer shell electrons from the nucleus by the electrons of gallium.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Gallium's filled but poorly-shielding subshell (the "-block contraction") incompletely screens its outer electrons from the increased nuclear charge, so gallium's effective nuclear charge — and

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Question ID VK-145851