Lewis Dot Diagrams in Chemistry Class

1. Lewis Dot Diagrams Williamsburg High School for Architecture and Design Mr. Quinn and Ms. Tom 10/31/13

2. Aim • How do we keep track of valence electrons?

3. A Quick Recap… These are called Lewis dot diagrams

4. 3 Ways to Solve • They give us the number of valence electrons, and we solve

5. 3 Ways to Solve • They give us the electron configuration • The valence electrons are the last entry • e.g. 2-8-18-18-4 • Which element is this? • Then we solve

6. 3 Ways to Solve • They give us the number of electrons • Which element is this? • Look at the electron configuration • The valence electrons are the last entry • e.g. 2-8-18-18-6 • Then we solve

7. Let’s Draw!

8. The Saga Continues! • Which Lewis electron-dot diagram represents a boron atom in the ground state?

9. The Saga Continues! • An atom in the ground state contains a total of 5 electrons, 5 protons, and 5 neutrons. Which Lewis electron-dot diagram represents this atom?

10. The Saga Continues! • If the electron configuration of an atom of element X is 2-6, the electron dot symbol for the element is

11. Your Turn! • Which Lewis electron-dot diagram represents a nitrogen atom in the ground state?

12. Your Turn! • Which Lewis electron-dot diagram represents an atom in the ground state for a Group 13 element?

13. Your Turn! • Which Lewis electron-dot structure is drawn correctly for the atom it represents?

14. Your Turn! • The electron-dot symbol X: would best represent

15. Your Turn! • What is represented by the dots in a Lewis electron-dot diagram of an atom of an element in Period 2 of the Periodic Table? • the number of neutrons in the atom • the number of protons in the atom • the number of valence electrons in the atom • the total number of electrons in the atom

16. Your Turn! • Atom X has an electron configuration of 2-8-2. Which electron-dot symbol correctly represents this atom?

17. Your Turn! • Which electron-dot symbol represents the atom in Period 4 with the highest first ionization energy?