Nickel $(Z = 28)$ forms a paramagnetic complex $[NiX_4]^{2-}$ with a uninegative monodentate ligand $X^-$. The number of unpaired electrons in nickel and the geometry of this complex ion are,respectively:
- AOne,Square planar
- BTwo,Square planar
- COne,Tetrahedral
- DTwo,Tetrahedral
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