1. Electron Configurations

2. Electron Configurations ShellSublevels 1s 2s p 3s p d 4s p d f

3. Electron Configurations Orbitals s 1 p 3 d 5 f 7

4. Electron Configurations

5. When you’re filling an atom with electrons, where do you put them?

6. Aufbau Principle Rule 1: Each electron occupies the lowest energy level available.

7. Pauli Exclusion Principle Rule 2: Only two electrons per orbital, and they must have opposite spins.

8. Hund’s Rule Rule 3: In each sublevel, first put one electron in each orbital, then go back and start putting a second electron in each.

9. Electron Configurations

10. STOP

11. Electron Configurations We’re not going to talk about atoms.

12. Electron Configurations We are not even going to think about atoms.

13. Electron Configurations We’re going to book a concert.

14. Electron Configurations Seating levels further from the stage have more sections

15. Electron Configurations Seating levels further from the stage have more sections

16. Electron Configurations Seating levels further from the stage have more sections

17. STAGE Row 1 Row 2 Row 3 Row 4 Row 5 Section S P D F

18. STAGE Row 1 Row 2 Row 3 Row 4 Row 5 Section S P D F Your ticket says ROW 3 - SEC P - SEAT 2. Where is your seat?

19. STAGE Row 1 Row 2 Row 3 Row 4 Row 5 Section S P D F Your ticket says ROW 3 - SEC P - SEAT 2. Where is your seat?

20. STAGE Row 1 Rule 1 Row 2 Row 3 Row 4 Row 5 Everybody wants to sit as close to the stage as they can. -Mr. Aufbau

21. STAGE Row 1 Rule 2 Row 2 Row 3 Row 4 Row 5 Seats are in pairs. Every pair of seats can hold only two people. -Mr. Pauli

22. STAGE Row 1 Rule 3 Row 2 Row 3 Row 4 Row 5 People would rather sit next to an empty seat. But they will sit next to a stranger if it means they can be in a better section. -Mr. Hund

23. STAGE Row 1 Order of filling Row 2 Row 3 Row 4 Row 5 Which seats are really closest to the stage?

24. STAGE Row 1 Order of filling Row 2 Row 3 Row 4 Row 5 Which seats are really closest to the stage?

25. STAGE Row 1 Now let’s fill some seats! Row 2 Row 3 Row 4 Row 5

26. STAGE Row 1 Now let’s fill some seats! Row 2 Row 3 Row 4 Row 5 You sold 25 tickets.

27. STAGE Row 1 Now let’s fill some seats! Row 2 Row 3 Row 4 Row 5 You sold 25 tickets. Which seats are filled?

28. STAGE Row 1 Row 2 Row 3 Row 4 Row 5 Section S P D F

29. STAGE Row 1 Row 2 Row 3 Row 4 Row 5 Section S P D F

30. STAGE Row 1 Row 2 Row 3 Row 4 3 4 Row 5 Section S P D F

31. STAGE Row 1 Row 2 Row 3 Row 4 3 4 Row 5 4 5 Row 6 4 5 Row 7 5 6 This is the order that you will sell tickets.

32. STAGE Row 1 Row 2 Row 3 Row 4 3 4 Row 5 4 5 Row 6 4 5 Row 7 5 6 This is the order that you will sell tickets.

33. STAGE Row 1 Row 2 Row 3 Row 4 3 4 Row 5 4 5 Row 6 5 6 Row 7 6 7 S D P 4 5 F This is the order that you will sell tickets.

34. STAGE Row 1 Row 2 Row 3 Row 4 3 4 Row 5 4 5 Row 6 5 6 Row 7 6 7 S D P 4 5 F We’re going to hire an usher to be in charge of each row in our chart.

35. STAGE Row 1 Helen Row 2 Neal Row 3 Aaron Row 4 3 4 Kris Row 5 4 5 Xavier Row 6 5 6 Ron Row 7 6 7 Unice S D P 4 5 F We’re going to hire an usher to be in charge of each row in our chart.

36. STAGE Row 1 Helen Row 2 Neal Row 3 Aaron Row 4 3 4 Kris Row 5 4 5 Xavier Row 6 5 6 Ron Row 7 6 7 Unice S D P 4 5 F We’re going to hire an usher to be in charge of each row in our chart.

37. STAGE Row 1 Helen Row 2 Neal Row 3 Aaron Row 4 3 4 Kris Row 5 4 5 Xavier Row 6 5 6 Ron Row 7 6 7 Unice S D P 4 5 F You sold 25 tickets.

38. STAGE Row 1 Helen Row 2 Neal Row 3 Aaron Row 4 3 4 Kris Row 5 4 5 Xavier Row 6 5 6 Ron Row 7 6 7 Unice S D P 4 5 F Which seats are filled?

39. RowSection SeatsUsher 1 S 2 Helen 2 S 2 2 P 6 Neal 3 S 2 3 P 6 Aaron 4 S 2 3 D 5 1S 2 2S 2 2P 6 3S 2 3P 6 4S 2 3D 5

40. Which seats are filled? RowSection SeatsUsher 1 S 2 Helen 2 S 2 2 P 6 Neal 3 S 2 3 P 6 Aaron 4 S 2 3 D 5 Aaron’s row is full, plus 4S 2 3D 5

41. Which seats are filled? RowSection SeatsUsher 1 S 2 Helen 2 S 2 2 P 6 Neal 3 S 2 3 P 6 Aaron 4 S 2 3 D 5 [Ar] 4S 2 3D 5

42. STAGE Row 1 Helen Row 2 Neal Row 3 Aaron Row 4 3 4 Kris Row 5 4 5 Xavier Row 6 5 6 Ron Row 7 6 7 Unice S D P 4 5 F Try some others!

43. Read Section 5.3 Practice Problems 18-22 on page 139 Homework