Which lanthanoid from following has highest ionisation ( IE_1 ) enthalpy?

MHT CET 2025 Chemistry question

Which lanthanoid from following has highest ionisation () enthalpy?

(A)Tm
(B)Dy
(C)Nd
(D)YbCorrect

Answer: (D)

Solution

Across the lanthanoids the first ionisation enthalpy rises slowly from about 530 kJ (La/Ce/Pr/Nd) to about 600 kJ because of increasing nuclear charge and the poor shielding by 4f electrons (lanthanoid contraction).

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Question ID VK-102827