1. Metallic Bonding Science 10

2. Metallic Bonding Occurs between metals Form giant structures where electrons are free to move The bond is the force of attraction between metal ions and free electrons Fixed cations in a sea of electrons

3. Properties of Metals Can you think of some?

4. Properties of Metals Can you think of some? – Silver, shiny, soft – Reactive, form cations by losing electrons – Poor insulators – Good conductors

5. Properties of Metallic Bonds Bonds are strong – Maintain regular structure (solids) – High melting and boiling points Good conductors of electricity and heat – Sea of free electrons carries heat through the metal

6. Properties of Metallic Bonds Ductile and malleable – Free electrons allow metal atoms to slide over each other – Ductile - drawn out – Malleable- hammered into sheets

7. Metallic Animation http://www.youtube.com/watch?v=ijw8 OBt4btM http://www.youtube.com/watch?v=ijw8 OBt4btM

8. Classwork Create a table comparing ionic, covalent and metallic bonding Venn diagram of 3 types of bonds

9. Other Molecular Forces When we say something is polar we mean that it has two opposite ends. The earth is polar. It has a north and a south pole. These poles have magnetic properties.

10. And this affects the way the earth interacts with other forces in the universe.

11. Hydrogen Bonding Atoms can also be polar. Because the nucleus of an oxygen atom is so much bigger then the nucleus of a hydrogen atom, the electrons in a water molecule move slightly towards oxygen.

12. Because the oxygen has more electrons around it that atom will have a slightly negative charge. The hydrogen atoms are left with a slightly positive charge.

13. This polarity causes water molecules to be attracted to one another. Demo: drops of water on a coin, water bridge.

14. Hydrogen Bonding An element that contains polar hydrogen atoms, can attract other polar molecules.

15. Van der Waals (London Dispersion) Electrons are always floating around an atom randomly. Sometimes, the electrons will end up closer to one side of the atom. This will make the atom polar for a moment.

17. Homework: Study for quiz: naming and making ionic, polyatomic and molecular compounds.