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The d & f Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
Answer the following questions: Which element of the first transition series has highest third ionisation enthalpy?
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Answer

The trend in the third ionisation enthalpies is not complicated by the $4s$ orbital factor and shows the greater difficulty of removing an electron from the $d^5 (Mn^{2+})$ and $d^{10} (Zn^{2+})$ ions.

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