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Asked by P Murali Krishna
May 4, 2015
Member since Apr 28, 2014
When two atoms with different electro-negativities combine to form a covalent bond, the electron density between atoms is shared in such a way that it is displaced more towards the more electronegative atom.
As a result, the more electronegative atom gets a partial negative charge, while the less electronegative atom gets a partial positive charge. The partial positive and negative charges on the dipole are indicated by the + δ and - δ, respectively.
Therefore, in hetero-atomic molecules in which the two atoms differ considerably in electro-negativity, two electric poles develop. We say that the molecule has developed polarity.
The covalent molecule with the two oppositely charged poles is called a dipole.
For example, the dipole in hydrogen chloride,is represented as
H+δ – Cl -δ
Hence, the bond is called a polar covalent bond, and the molecule is called a polar covalent molecule.