Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory.
`[CoF_(6)]^(3-),[Fe(CN)_(6)]^(4-) and [Cu(NH_(3))_(6)]^(2+)`

Explanation

In the complex ion `[CoF_(6)]^(3-),Co^(3+)(3d^(6))` has the electronic configuration `t_(2g)^(4)e_(g)^(2)` because `F^(-)` is a weak- field ligand (low `Delta_(o)` value). In `[Fe(CN)_(6)]^(4-), Fe^(2+)(3d^(6))` has the electronic configuration `t_(2g)^(6)e_(g)^(0)` because `CN^(-)` is a strong - field ligand (high `Delta_(o)` value). In `[Cu(NH_(3))_(6)]^(2+), Cu^(2+)(3d^(9))` has the electronic configuration `t_(2g)^(6)e_(g)^(3)`.