JEE Main Chemistry question

Statement 1 (Assertion): The ionization energy of gallium remains nearly the same as that of aluminium. Statement 2 (Reason): This is due to shielding of outer shell electrons from the nucleus by the d 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 ten electrons shield the nuclear charge poorly, so its valence electrons experience a higher effective nuclear charge than expected; this compensates for the increase in atomic size on going from Al to Ga, keeping gallium's

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Question ID VK-138322