According to the valence bond theory, the molecule HCl is formed by the overlap of the 2p orbital of chlorine and the 1s orbital of hydrogen.
Valence bond theory
According to the valence bond theory, a bond is formed when there is an overlap of two orbitals of appropriate energy on the hydrogen and the chlorine atoms.
This overlap involves the 2p orbital of chlorine and the 1s orbital of hydrogen. This is the valence bond account of the bonding in HCl.
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