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Chemical Bond Classification • Chemical bonds are classified by the way the electrons are held between the atoms that are bonding to each other. Chemical Bond Classification • Electrons can be held in a bond by one of two ways: –Electrons are equally shared by both atoms. (Covalent) –Electrons are “exchanged” from one atom to another forming ions. (Ionic) Properties of Covalent Bonds • Covalent bonds occur between two non-metal atoms. • In covalent bonds electrons are shared by the atoms involved in the bond. Examples of Covalent Bonds • Examples of compounds formed with covalent bonds include: –Hydrogen gas (H2) –Ammonia (NH3) –Large biological molecules such as glucose (C H O ). 6 12 6 Properties of Ionic Bonds • Ionic bonds occur between a metal atom and a non-metal atom. • In ionic bonds electrons are exchanged or transferred from the metal atom to the non-metal atom. • After the transfer of electrons, both atoms become oppositely charged, keeping both atoms together (bonded).
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