Find the number of $t_{2 g}$ electrons in ${[{NiF}_{6}]}^{2 -}$

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answer is 6.

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Detailed Solution

Oxidation state of Ni in [NiF₆]^-2,is +4. Outer electronic configuration of Ni is 4s² 3d⁸and Ni⁴⁺ has 3d⁶. Number of electrons in t_2gis 6 and in e_g is 0.

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