Acovalent chemical bond is one in which a covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms electrons from the same atom, but opposite spins, are paired outer-shell electrons of one atom are transferred to fill the inner electron shell of another atom

            A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill their respective orbitals.

Explanation:

                   Covalent bonds are formed between two atoms having their electronegativity difference less than 1.7. In this type of bonding the valence electrons of one atoms forms molecular bond with the valence electrons of another atom. The electrons are mutually shared.

                   Covalent bond can be non-polar as for example formed between hydrogen and carbon atoms.

                   Also, covalent bond can be polar in nature as that formed between hydrogen and chlorine atoms because the chlorine atom is more electronegative and hence attracts the electrons more towards itself making density of electrons less on hydrogen atom.