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(A) The central metal ion in $[CoCl_4]^{2-}$ is $Co^{2+}$.Electronic configuration of $Co$ $(Z=27)$ is $[Ar]3d^74s^2$.Electronic configuration of $Co^

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$3$

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(A) The central metal ion in $[CoCl_4]^{2-}$ is $Co^{2+}$.Electronic configuration of $Co$ $(Z=27)$ is $[Ar]3d^74s^2$.Electronic configuration of $Co^{2+}$ is $[Ar]3d^7$.Since $Cl^-$ is a weak field ligand,the electrons in the $3d$ orbitals of $Co^{2+}$ remain unpaired according to Hund's rule.The $3d^7$ configuration is represented as: two pairs and three unpaired electrons.Therefore,the number of unpaired electrons is $3$.

How many unpaired electrons are present in the central metal ion of $[CoCl_4]^{2-}$?

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