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

Explanation

To explain why the hexaquo manganese(II) ion contains five unpaired electrons while the hexacyano manganese(II) ion contains only one unpaired electron using crystal field theory, we can follow these steps:

### Step 1: Determine the Electron Configuration of Manganese
- The atomic number of manganese (Mn) is 25. In its neutral state, the electron configuration is:
\[ \text{Mn: } [\text{Ar}] 3d^5 4s^2 \]
- In the +2 oxidation state (as in both complexes), manganese loses two electrons, typically from the 4s orbital first, resulting in:
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