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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
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Four successive members of first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy
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Correct option: C
Manganese (Z = 25)
Option C is correct because Manganese (Z = 25) has an electronic configuration of 3d⁵4s², and removing the third electron requires removing an electron from the stable, half-filled 3d orbital, resulting in a significantly higher ionization enthalpy.
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