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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

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Correct option: C

Manganese

(Z=25)

The correct answer is Manganese (Z=25) because after removing two electrons, it attains a stable half-filled d-orbital configuration, resulting in a higher third ionization enthalpy.

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