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Introduction to Quantum Mechanical Model

Why is Mn2+ m...

Question

Why is Mn2+ more stable than ground state Mn.
Mn2+(has only half filled d orbital)
Mn(has both half filled d orbital and fully filled s orbital)
Isnt Mn more stable than Mn2+

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Solution

1. The electronic configuration:

Mn (ground state) = [Ar] 3d⁵4s²

Mn²⁺ (excited state) = [Ar]3d⁵

we see that d⁵ configuration is highly stable due to half filled configuration.

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Similar questions

State True or False.

Half-filled and fully-filled orbitals are more stable.

Q. Assertion :The third ionization energy of manganese (At no. 25) unexpectedly high. Reason: Loss of two electrons gives the configuration of

M n^{2 +}

3 d^{5}

where d-orbital is half filled and thus, very stable.

Q. Assertion :Half-filled and fully-filled degenerate orbitals are more stable. Reason: Extra stability is due to the symmetrical distribution of electrons and exchange energy.

Q. Explain why:

M n^{2 +}

is more stable than

F e^{2 +}

towards oxidation to +3 state.
(At. no. of Mn = 25, Fe = 26)

Why cu2+ more stabler than cu+ though cu+ has completely filled d orbital?

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