(C) The $3d-$ transition series consists of elements with atomic numbers $21$ to $30$ ($Sc$ to $Zn$).Cobalt $(Co)$ has an atomic number of $27$,which

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(C) The $3d-$ transition series consists of elements with atomic numbers $21$ to $30$ ($Sc$ to $Zn$).Cobalt $(Co)$ has an atomic number of $27$,which places it in the $3d-$ series.Its electronic configuration is $[Ar] 3d^7 4s^2$,confirming it belongs to the $3d-$ transition series.