Question

Hello..✌️✌️. Why is third ionisation energy of Mn unexpected high??​

Answer 1

Answer:

Atomic no. of Mn = 25 and electronic configuration is: [Ar]4s23d5 . Loss of two electrons gives the configuration of Mn2+ as [Ar]3d5 where d-orbital is half filled and thus very stable. Therefore the third ionisation energy is very high as the third electron is to be removed from the stable configuration of Mn2+.

Explanation:

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Answer 2

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So, when two electrons are removed then configuration of manganese becomes . ... When another electron is removed then ionization energy will become exceptionally high because the 3d orbital is stable and thus high heat or energy has to be provided in order to remove an electron from it.

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