The Hydrogen Molecule

This is a representation of the electron cloud about the hydrogen atoms. The identical electron clouds about each hydrogen atom indicate that in the hydrogen molecule, the electrons are shared equally between the two hydrogen nuclei because both H atoms have the same electronegativity. The bond that forms between the hydrogen nuclei is said to be a nonpolar covalent bond.

Other diatomic molecules such as

also have nonpolar covalent bonding because the two identical atoms have identical electronegativities.