Covalent bonds are formed when nonmetal and nonmetal atoms forms a molecule. The chemical bond is created when electrons are shared between the two atoms. + 9 others found this useful. Vivian Liang. Edit. Share to: Chrishan Silva. 509,209 Contributions. I'm an undergraduate in Physical Sciences stream. polar covalent bond is formed when 2 atoms are sharing the same electron unequally. It occurs because one of the atoms has a stronger affinity for electrons that the other. …. 24 people found this useful. 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.