1. PES Data
Elements 1-21

2. Examining Electron Energies

3. Photoelectron Emission Spectroscopy

4. 1 electron

9. 3

10. 4

11. 5

12. 6

13. 7

14. 8

15. 9

16. 10

17. 11

18. 12

19. 13

20. 14

21. 15

22. 16

23. 17

24. 18

25. 19

26. 20

27. 21
3d electron

30. Why? Look at Orbital Diagrams
Compare Nitrogen and Oxygen
Compare Beryllium and Boron

31. Orbital Diagrams
Compare Nitrogen and Oxygen
There is ______________________on the 2p suborbital for oxygen’s 8th electron

32. Compare Beryllium and Boron
Even though there is electron repulsion on the 2s electrons for Be, it is easier to remove the 5th electron from B because it is _________________from the nucleus