Valence bond theory was proposed by Linus Pauling and later supported by slater. This theory explains the formation of a covalent bond between the atoms of molecules.
Postulates of valence bond theory
The important postulates of the valence bond theory are listed below.
- A covalent bond is formed by overlapping of valance orbitals or salts containing unpaired electrons with antiparallel spin.
- The strength of overlap determines the strength of bonding between the atoms in the molecule.
- The overlapping of orbitals is always directional.
- The overlapping depends upon the size and energy of the orbitals.
- A sigma bond is formed by the axial overlap of orbitals.
- A π bond is formed by the axial overlap of orbitals.
- Greater is the overlapping of orbitals stronger is the bond and stable is the molecule.