Nickel (Z=28) combines with a uninegativ...

Nickel `(Z=28)` combines with a uninegative monodentate ligand `X^(-)` to form a paramagnetic complex `[NiX_4]^(2-)`. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively:

one, square planar

two, square planar

one, tetrahedral

two, tetrahedral

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