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Most atoms need 8 electrons to complete their outer shell. So, an atom that has 2 outer electrons will often form a chemical bond with an atom that lacks two electrons to be complete. For example, a sodium atom has one lone electron in its outer shell.
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. â¦. 24 people found this useful. 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.