Chemistry - Coordination Chemistry Question with Solution | TestHub

Nickel $(Z=28)$ combines with a uninegative monodentate ligand ${\mathrm{X}}^{-}$to form a paramagnetic complex ${\left[{\mathrm{NiX}}_4\right]}^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively