Usually, covalent bonds are formed between two nonmetals. Covalent bonds are characterized by the sharing of valence electrons between the pair of bonding elements. The only difference between a polar covalent and nonpolar covalent is the configuration of the sharing of electrons. Polar covalent has unequal sharing, which is opposite to nonpolar covalent. Nevertheless, these two classifications of bonding is only applicable between two nonmetals. A metal and nonmetal bonding is not possible because this would result to an ionic bond, which is the complete transfer of valence electrons from one to the other so that each follows the Octet rule and becomes stable.
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