Question

Using valence bond theory, predict the hybridization and magnetic character of the complex:

[Ni(CO)₄] (Atomic number: Ni = 28)

Answer 1

The complex [Ni(CO)₄] involves sp³ hybridisation.

The complex is diamagnetic, as evident from the absence of unpaired electrons.

Orbitals of Ni:

↑ ↓	↑ ↓	↑ ↓	↑	↑		↑ ↓
3d						4s		4p

sp³ hybridised orbitals of Ni:

↑ ↓	↑ ↓	↑ ↓	↑ ↓	↑ ↓
3d						sp3 hybrid

[Ni(CO)₄] (low spin complex):  

↑ ↓	↑ ↓	↑ ↓	↑ ↓	↑ ↓		XX	XX	XX	XX
3d						sp3 hybrid