M2: Ionic, metallic and covalent bonding — Concepts

I can

• Describe how ionic compounds have no overall electric charge
• Explain how the octet rule and no overall electric charge leads to the chemical formula of an ionic compound
• Explain why ionic compounds form lattices and crystals
• Describe metallic bonding
• Explain how the following properties of metals come from delocalised electrons
  • Malleable
  • Lustrous
  • Electrically conductive
  • Thermally conductive
  • High melting point
• Describe how alloys have different properties from their constituent metals.
• Explain why covalent compounds usually exist as molecules
• Describe covalent networks
• Describe how covalent compounds can be a lot more complex than ionic or metallic compounds.