what is the diffrence between a polar and non-polar covalent bond in atoms?

Answer 1

In a polar covalent bond, the electrons are shared unequally between atoms. Example: H-F. The electronegativity of fluorine is 4.0, that of hydrogen 2.2. So there is a slight negative charge on F and a slight p[ositive charge on H.

Example: F-F. No matter how electronegative fluorine is, the covalent bond is nonpolar, because electronegativities are equal.