$[C o F_{6}]^{3 -}$ is a coordination complex ion.
How many unpaired electrons are there in the complex?

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Solution

In the complex $[C o F_{6}]^{3 -}$ , the oxidation number of Co is +3. The outer electronic configuration of $C o^{3 +}$ ion is $3 d^{6}$ . It can also be written as $t_{2 g}^{4} e_{g}^{2}$ . Thus there are 4 unpaired electrons, 2 in $t_{2 g}$ level and 2 in $e_{g}$ level.

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