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Unformatted text preview: 1 Ionic Bonds Positively and negatively charged ions attract each other to form an ionic bond In the body , ionic bonds are found mainly in teeth and bones (hard tissues) The Ionic Bond in Sodium Chloride Sodium loses an electron to become Na+ ( cation ) Chlorine gains an electron to become Cl- ( anion ) Na+ and Cl- are attracted to each other to form the compound sodium chloride (NaCl) table salt Ionic compounds generally exist as solids e.g. bone tissue and teeth. Covalent Bonds Atoms share electrons to form covalent bonds single bond = share 1 pair double bond = share 2 pairs triple bond = share 3 pairs Covalent bonds may share electrons unequally between the atoms involved ( why?) Polar Covalent Bonds Unequal sharing of electrons between atoms. In a water molecule, oxygen attracts the hydrogen electrons more strongly Oxygen has greater electronegativity as indicated by the negative Greek delta sign....
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- Fall '08