1. - - - - - - - - - - - +13 - - Metallic Bonding

2. - - - - - - - - - - +13 During metallic bonding the valence electrons become delocalized. - - -

3. - - - - - - - - - - +13 Sea of Electron Model Metallic Bonding is the result of delocalized valence electrons and the electrostatic force. - - -

4. Sea of Electron Model

20. Explains the properties of metals: Metals are good conductors --Heat --Electricity Metals are malleable Metals are ductile Metals have high melting points Tightly bound cations are surrounded by a sea of negative delocalized electrons. There is a very strong electrostatic force holding metals together.

21. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points

22. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points Metals conduct thermal energy (heat) quite well because the delocalized electrons are capable of transferring kinetic energy very easily. Also, the close packing of metal atoms allows them to transfer vibrational energy between one another much more efficiently.

23. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points

25. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points Electricity is the flow of electrons. Delocalized electrons that are already freely moving are capable of conducting electricity very well. Electrons usually move randomly but when connected to a battery electrons in a metal will stream towards the positive end.

26. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points

27. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points ++++++

28. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points Malleable: capable of being pounded into thin sheets.

29. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points DUCTILE: capable of being stretched into thin wire.

30. Sea of Electron Model Explains the properties of metal: Metals are good conductors --Heat --Electricity Metals are malleable Metals are Ductile Metals have high melting points Metals: transfer thermal energy well and are tightly held together by electrostatic forces and resist melting.

31. ASSIGNMENT [1]What is an alloy, why are they useful? List three practical alloys and explain their application. [2] What metal is a liquid at room temperature and why? [3] Explain the disappearing spoon trick in chemistry. [4] In you own words, what is metallic bonding and how does it explain the properties of metals?