JEE Main Chemistry question

The pair of elements having approximately equal ionisation potential is

(A)Al, GaCorrect
(B)Al, Si
(C)Al, Mg
(D)Al, B

Answer: (A)

Solution

Gallium lies just after the 3d transition series, whose ten d-electrons shield the nuclear charge poorly; this partially offsets the expected decrease in ionisation energy from the increase in atomic size going from Al down to Ga.

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Question ID VK-133191