The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using the crystal field theory.

Explanation

Take Hexaqua manganese (II) for example - Mn has an oxidation state of +2 and an electronic configuration of d5 in this molecule.


Because `"H"_2"O"` is a weak ligand and the crystal field is octahedral, the electron configuration will be `"t"_2"g"^3"eg"^2`.


As a result, there are a total of 5 unpaired electrons.


Take a look at hexacyanoion:- Mn has an oxidation state of +2 in this chemical. Pairing will occur since it is surrounded by powerful ligands `"CN"^-`.


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