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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which of the following metal is expected to have the highest third ionisation energy ?

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Correct option: C

\mathrm{Mn}(\mathrm{Z}=25)

Option C (Mn(Z=25)) is correct because removing the third electron from Mn requires removing an electron from a stable half-filled d-orbital configuration.

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