predict the number of unpaired electrons in `[CoF_6]^(3-)` and `[Co(NH_3)_6]^(3+)`

Explanation

`[CoF_6]^(3-)`
O.S. of Co = +3`" "`E.C. of `Co^(3+)`: `3d^6`
No pairing the hence No. of unpaired electrons = 4
`[Co(NH_3)_6]^(3+)`
O.S. of Co = +3`" "`E.C. of `Co^(3+)` : `3d^6`
After pairing no. of unpaired electrons=0