This is a small presentation designed around Lewis Numbers. The content would be appropriate for a grade 10 Physical Science learner, in a CAPS curriculum school.

1. LEWIS DIAGRAMS
EXPLAINED

2. WHO WAS GILBERT LEWIS?
• Gilbert Newton Lewis was an American physical
chemist and a former Dean of the College of Chemistry
• Lewis was best known for his discovery of the covalent
bond and his concept of electron pairs; his Lewis dot
structures and other contributions to valence bond
theory have shaped modern theories of chemical bonding.
Lewis successfully contributed to chemical
thermodynamics, photochemistry, and isotope separation,
and is also known for his concept of acids and bases

3. GROUPS & VALENCE
ELECTRONS

4. HOW TO DRAW A
LEWIS STRUCTURE

5. WHERE IS CARBON ON THE PERIODIC TABLE?

6. Carbon has 4 valence electrons

8. LEWIS
STRUCTURES
OF
MOLECULES

9. Let’s look at Hydrochloric Acid (HCl)

10. You will be required to leave it this this form:

11. Differences between Line and Dot Structures

12. Examples:
Draw the Lewis Diagram of the following:
1. BeF2
2. BCl3
3. CCl5
4. PBr5
5. SI6

13. THE END