Question

# What are the postulates of valence bond theory ?

Solution

## Valence bond theory :  i) The Central metal. atom/ion Makes available a number of vacant orbitals equal to its coordination  number ii) These vacant orbitals form covalent bonds with the ligand oerbitals.iii) A covalent boil& is formed by the overlap of vacant metal orbital and filled ligand orbitals. This complete overlap leads to the formation of a metal ligand, a bond. iv) A strong covalent is formed only when the . orbitals overlap to the Maximum extent. This maximum overlapping is possible only when the metal vacant orbitals undergo  process called. A hybridised orbital characteristics than an has a better directional unhybtidised one.v) The following table gives the coordination number, orbital hybridisation and spatial geometry of the more important geometries.Coordination numberTypes of hybridisationGeometry2$$sp^1$$linear4$$sp^3$$tetrahedral4$$sp^2$$square planar6$$d^2sp^3$$Octahedral6$$sp^3d^2$$OctahedralMagnetic moment A species having atleast one unpaired electron, is said to be pan magnetic. It is attracted by an external field. The paramagnetic moment is given by, the following spin-only formula$$\mu_3=\sqrt{n(n+2)BM}$$$$\mu_3$$= spin-only magnetic moment n = number of unpaired electronsBM = Bohr magneton, the unit which expresses the magnetic moment.Chemistry

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