Introduction to covalent bond
A covalent bond is a type of chemical bond. Two or more atoms use their outer electrons together to achieve the state of electron saturation under ideal conditions, thus forming a relatively stable chemical structure. A strong effect formed by several adjacent atoms sharing electrons and sharing electrons is called covalent bond. The essence is that after the atomic orbits overlap, there is a high probability that the electrons between the two nuclei and the electrical interaction between the two nuclei.