1. Electrons The negatively charged subatomic particle

2. Let’s review the structure of the atom 12 p + 12 n 0 An atom consists of the following things: Nucleus with protons and neutrons Electron cloud with electrons on the orbitals So why are these electrons a different color???

3. Valence Electrons These electrons are the ones on the outermost shell of an atom (on the last orbital) that are involved in bonding. An atom may only have a MAXimum of 8 valence electrons. Having 8 valence electrons is called an octet.

4. The periodic table has 8 representative groups 1 2 3 45 6 7 8

5. Notice how the location of the element reveals how many valence electrons it has

6. Now that you know all this, how can you use this information to draw Lewis Electron Dot Diagram Example: Draw the Lewis Electron Dot Diagram for the element Nitrogen. 1 st : Figure out what Representative group Nitrogen is in. That will tell you how many valence electrons it has. It’s in group 5 so it has 5 valence electrons. 2 nd : Write the symbol of the element. N 3 rd : Draw the valence electrons around the symbol starting from the top and in a clockwise direction. Remember, NEVER more than eight and you must go around the symbol once before you put them in pairs.

7. What it shouldn’t look like. X X NO YES!!!

8. Your Assignment and ticket out the door. On your own paper, draw the Lewis electron dot diagrams for: 1.Helium 2.Oxygen 3.Boron 4.Magnesium 5.Argon