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In contrast, covalent bonding is a bond formed when atoms share electrons to attain stability, Ionic bonding is a bond which involves complete transfer of electron.
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Ionic bond is formed when a metal bonds with a non-metal by transferring some of electrons. Covalent bonding, just a sharing of electrons that exists between or among non-mentals. However, there are cases when polar covalent bond involves a metal and a non-metal, like Aluminim chloride.