1. Chapter 5-4 Bonding in metals
Warm up: Explain the difference between polar and nonpolar bonds.

2. Stronger and less likely to react with air or water
A. Metals and alloys
Alloy: is a mixture made of two or more elements that has the properties of metal.
Stronger and less likely to react with air or water

3. Similar to what their metal properties are
1. Physical Properties
Similar to what their metal properties are

4. Don’t react with water or air unlike their metal components
2. Chemical Properties
Don’t react with water or air unlike their metal components

5. Metals exist as CRYSTALS
B. Metallic bonding
Usually lose e-
Become + charged
Metals exist as CRYSTALS
Metallic bond: an attraction between a positive metal ion and the e- surrounding it.
Metal or metal alloy consists of + metal ions surrounded by a “sea” valence e-
(fig 23 pg 174)

6. C. Metallic Properties
“sea” of e- explains why metals can bend, conduct electricity and heat.

7. Metallic bonds prevent the metal from breaking
1. Changes in shape
Metallic bonds prevent the metal from breaking
Metal ions move easily bend and are ductile

8. 2. Electrical Conductivity
e- move freely… allowing them to conduct electricity

9. Shiny and reflective due to valence e-, they absorb and give off light
3. Luster
Shiny and reflective due to valence e-, they absorb and give off light
Good for mirrors, buildings, jewelry

10. Freely moving e- transfer energy in the form of heat to nearby atoms
4. Heat Conductivity
Freely moving e- transfer energy in the form of heat to nearby atoms
Heat moves easily