👉 In chemistry, a covalent bond is a type of chemical bond between two non-metallic atoms. It involves the sharing of electrons between the atoms to form a positive charge on each atom and a negative charge on the other atom. The strength of the covalent bond depends on the electronegativity difference between the two atoms, which can be expressed as the difference in valence electron configuration or the difference in atomic radii. Covalent bonds are important for many chemical processes such