There are ............... electron in $t_{2 g}$ orbitals in $[C o F_{6}]^{3 -}$ .

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Solution

In $[C o F_{6}]^{3 -}$ , the central cobalt atom has +3 oxidation state and has electronic configuration $3 d^{6}$ . Since, fluoride is a weak ligand, the electrons will prefer to go to $e_{g}$ level than pair up. Hence, the outer electronic configuration will be $t_{2 g}^{4} e_{g}^{2}$ .
$[C o F_{6}]^{3 -}$ has 4 electrons in $t_{2 g}$ orbitals.

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