ChemistryMedium60×since 2002Q708Nickel (Z = 28) combines with a uninegative monodentate ligand X^– to form a paramagnetic complex [NiX₄]^2− . The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectivelyAone, tetrahedralBtwo, tetrahedralCone, square planarDtwo, square planarCheck answerSkip