Identify the element having highest ionisation enthalpy ( IE_1 ) from following

MHT CET 2025 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2025

Identify the element having highest ionisation enthalpy () from following

(A)Ce
(B)La
(C)Gd
(D)YbCorrect

Answer: (D)

Solution

First ionisation enthalpies of the lanthanoids are about 530-640 kJ mol and rise slowly with the lanthanoid contraction. Approximate values: La 538, Ce 534, Gd 593, Yb 603 kJ mol. Yb () has a completely filled 4f subshell and a filled 6s

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Question ID VK-102065