1. How to Write Lewis Dot Structures Dot structures represent valence electrons. Valence electrons are electrons in the outermost energy level of an atom. Important for Bonding!!! A Trick for Drawing them! Bohr Diagram for Sodium

2. 1A-8A are called the Representative Elements

3. Column number 1A-8A indicates the number of valence electrons Part of the reason the periodic table has the weird shape that it does is so that there is such a repeating pattern in electron configurations. 1a 2a3a4a5a6a7a 8a

4. Dot Diagrams: Lithium – Neon 1a 2a3a4a5a6a7a 8a Start on right  like a clock

5. Assignment: Draw Dot Diagrams for 1) Silicon, 2) Aluminum, 3) Calcium, 4) Potassium, 5) Sulfur, 6) Iodine, 7) Phosphorous and 8) Argon. 1a 2a3a4a5a6a7a 8a