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Write the main postulates of valence bond theory (VBT).

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(a)  A covalent bond is formed by the partial overlap of two half-filled atomic orbitals of two atoms. 

(b)  Greater the overlapping of atomic orbitals between the atoms, stronger the covalent bond formed. 

(c)  When a covalent bond is formed, the energy of the molecule decreases and the molecule becomes more stable. 

(d)  The extent of overlapping of orbitals follows the following order. s-s overlapping < s-p overlapping < p-p overlapping. 

(e)  Overlapping along the axis is stronger than the overlapping on sideways.

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