Polar bond
A polar bond is a certain class of a covalent bond. We can also say that it is the dividing line between the formation of a pure covalent bond and an ionic bond. However, if we want to define it more accurately, a polar covalent bond is a bond that exists between two atoms consisting of electrons that are unevenly distributed. Due to this state, the molecules tend to have some electrical dipole moment wherein the two ends are either slightly positive or negative.
Role of electronegativity
Electronegativity plays a major role in determining the different types of covalent bonding. Electronegativity is the tendency of an atom to attract a shared pair of an electron towards itself. It has no units simple it is a tendency. The covalent bond formed between two atoms in molecules whose electronegative difference exists is known as a polar covalent bond.
Polar covalent bonds are usually formed between two nonmetal atoms having different electronegativities.
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