Flexi Says: A non-polar covalent bond is a covalent bond in which the bonding electrons are shared equally between the two atoms. In a non-polar covalent bond, the distribution of electrical charge is balanced between the two atoms. A bond in which the electronegativity difference between the atoms is between 0.4 and 1.7 is called a polar covalent bond. A polar covalent bond is a covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal. In a polar covalent bond, sometimes simply called a polar bond, the distribution of electrons around the molecule is no longer symmetrical.
