2. • Bonds are formed between elements that can
rearrange their molecules to create stable compounds.
• Bonds only form when energy is put in or taken away
(endothermic or exothermic)
• For bonds to form, the outer energy level must equal 8
(octet rule) for one of the elements.
• Ionic bond – between metal and nonmetal
– Electrons are transferred
• Covalent bond – nonmetal and nonmetal
– Electrons are shared
• Metallic bond – metal and a metal
3. How to identify Bonds
• Locate the elements on periodic table
• Determine if the element is a metal, nonmetal
• Identify the bonds
• EXAMPLES:
• Na (metal) + Cl (nonmetal) = ionic bond
– electrons are transferred
• C (nonmetal) + O (nonmetal) = covalent bond
– Electrons are shared
• Cu (metal) + Sn (metal) = metallic bond
