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There are two types of covalent bonding - nonpolar and polar. Nonpolar bonding results when two
identical non-metals equally share electrons between them. Diatomic molecules such as O₂
or I₂ form nonpolar covalent bonds where both atoms share the electrons equally. Polar
bonding results when two different non-metals unequally share electrons between them. Compounds
such as carbon dioxide, ammonia, and water have polar covalent bonds. Certain other compounds,
such as ethane (C₂H₆), have both polar and nonpolar bonds. Ethane, has polar bonds
between the carbon and hydrogen, and nonpolar bonds between the two carbon atoms.
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