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Unit 3 ATOMIC CONCEPTS 3.9 What is a Lewis Diagram AIM: How do I draw a Lewis Diagram of any element? DO NOW: Draw a planetary model of Oxygen. How many.

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Presentation on theme: "Unit 3 ATOMIC CONCEPTS 3.9 What is a Lewis Diagram AIM: How do I draw a Lewis Diagram of any element? DO NOW: Draw a planetary model of Oxygen. How many."— Presentation transcript:

1 Unit 3 ATOMIC CONCEPTS 3.9 What is a Lewis Diagram AIM: How do I draw a Lewis Diagram of any element? DO NOW: Draw a planetary model of Oxygen. How many valance electrons does it have? It has 6 valance electrons

2 Review What is a valance electron? It is the number of electrons In the outer (last) shell of an atom

3 LEWIS ELECTRON DOT DIAGRAM Chemical symbol surrounded by one to eight dots representing electrons. Definition X

4 LEWIS ELECTRON DOT DIAGRAM # of dots = valance electrons More Information

5 X Picture One valance electron LEWIS ELECTRON DOT DIAGRAM

6 P Example Phosphorus (P) has an electron configuration of 2-8-5 LEWIS ELECTRON DOT DIAGRAM

7 TRY THIS Draw Lewis Dot Diagrams of Helium (He) and Nitrogen (N) He N

8 NEXT Complete the INDEPENDENT PRACTICE When you are done, you may work on the following: CHEMISTRY VOCABULARY JOURNAL 3.8 PACKET (IF YOU DIDN’T FINISH) - you will be allowed to use this on your quizzes and (some of) your exams

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