1. Metallic Bonds Section 8.4 Sea of Electrons –Metal atoms contribute their valence e- Delocalized Electrons –E- are free to move throughout the solid b/c they are not attached to any single nucleus

2. Properties of Metallic Bonds 1.Metals are MALLEABLE Can be beaten into a thin sheet

3. Properties of Metallic Bonds 2.Metals are DUCTILE can be stretched into a thin wire

4. Properties of Metallic Bonds The reason why metals are malleable & ductile is due to their sea of electrons

5. Properties of Metallic Bonds 3.Metals are CONDUCTORS of heat and electricity Delocalized electrons are able to flow through the material since they are not attached to one central nucleus Not ConductiveConductive

6. Properties of Metallic Bonds 4. Metals have high melting and boiling points

7. Properties of Metallic Bonds 5.Luster- metallic shine Created by the delocalized electrons interacting with light

8. Alloy –Mixture of metals

9. 2 types of alloys Substitutional –Atoms of the 2 metals are about the same size Interstitial –One metal has much smaller atoms than the other