Applications of valence bond theory:
1) Nickel atom:
Outer electronic configuration 3d84s2
Number of unpaired electrons = 2
∴ µs = √2(2+2) = 2.83 BM
As the hybridisation is sp3, the geometry of the molecule is tetrahedral.2) [Ni(CN)4]2- :
The other possible geometry for the 4 coordinated complex is the square planar configuration including dsp2 hybridisation.
The ligand CN- is an influential ligand. Therefore it forces the unpaired electrons to pair up in d orbitals. Therefore this complex ion does not have unpaired electrons. It is diamagnetic.
The geometry of the above molecule is square planar.
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