When atoms of different electronegativities form a bond, the electrons tend to be more controlled by the atom with the higher electronegativity.
The resulting bond is a dipole â€" it has a slight negative fear on the higher electronegativity side, and a slight positive charge on the other end.
This type of bond is called a icy bond. Examples of polar bonded molecules include hydrochloric acid (HCl) and water (H2O).
Non-Polar Bonds
When atoms of similar electronegativities ploughshare electrons to form a covalent bond, the shared electrons tend to be evenly controlled by both atoms. The resulting bond is evenly supercharged on all sides, and is said to be a axenic non-polar covalent bond.
An example of this is nitrogen gas (N2).
Polar covalent bond
SO3 is a non polar molecule.
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