A nonpolar covalent bond is a covalent bond in which the bonding electrons are shared equally between the two atoms.
A covalent bond in which the electrons are shared equally is called a non-polar covalent bond.
If the electron pair is unequally shared between the bonded atoms, it results in polar covalent bond.
You share valence electrons in a covalent bond, and if they’re shared perfectly equally, it’s a 100% covalent bond.
What causes unequal sharing of electrons?
Atoms with high electronegativity values—such as fluorine, oxygen, and nitrogen—exert a greater pull on electrons than do atoms with lower electronegativity values. In a bond, this can lead to unequal sharing of electrons between atoms, as electrons will be drawn closer to the atom with higher electronegativity.
What is called double covalent bond?
A double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair. Some simple molecules containing double bonds. Oxygen, O2. Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram.