Objective/Warm-Up
• SWBAT distinguish between ionic, covalent, and metallic substances.
• Where on the periodic table are metals?• Where on the periodic table are non-
metals?
Foldable
• Different types of bonding:• Covalent• Ionic• Metallic
On the outside: put the name and a pictureInside top: put propertiesInside bottom: put examples
Properties of Covalent Compounds
• Low melting and boiling points• Soft• Sharing of electrons• Some dissolve in water• Do not conduct electricity• NON-METAL WITH NON-METAL• Electronegativity difference < 2.0
Examples
• Sugar• Water• Carbon dioxide• Oil• Wax
Ionic
Properties of Ionic Compounds
• High melting and boiling points• Hard, brittle• Transfer of electrons• Most dissolve in water• Conduct electricity in liquid form or when
dissolved in water• METAL WITH NON-METAL• Electronegativity difference > 2.0
Examples
• NaCl (salt)• KBr
• CaCl2• MgSO4
Metallic
Properties of Metallic Compounds
• Malleable-can be hammered flat• Ductile-can be pulled into a wire• Luster-shiny• A “sea of electrons”• Good conductors of heat and electricity• METAL WITH A METAL
Examples
• Gold• Copper• Sodium• Calcium• Magnesium• Platinum
Electrons occupy innermost shell first– Exposed electrons in outer shell
responsible for bonding
Chemical bond– Force of attraction between atoms that
holds them together
Ionic vs. Covalent BondsTransfer of electrons
Sharing of electrons
Metal with a non-metal
Two non-metalsFollows the octet rule
Wrap-Up
• Explain the following cartoon:
“Perhaps one of you gentlemen wouldn’t mind telling me just what outside the window you find so attractive…?”