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Why is third ionisation enthalpy of mang...

Why is third ionisation enthalpy of manganese exceptionally high ?

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`Mn^(2+)` has the configuration `[Ar]3d^(5)`. With highly symmetrical configuration , the removal of third electron is very difficult. Therefore, third ionisation enthalpy of the metal is exceptionally high ( `A_(i)H_(3)=3200kJ mol^(-1)`).
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
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