1. Chapter 4 - Atomic Structure
Notes on

2. Atoms

3. History of the Atom

5. The discovery of the electron…

6. J.J. Thomson’s Model

7. Rutherford and the nucleus

9. Parts of an Atom

10. Parts of an Atom: Particle charge mass location Proton Neutron
Electron

11. Quarks

12. Atomic Number

13. Mass Number

14. Atomic Mass Units

15. Mass of an Atom

16. Isotopes

17. Isotopes of Hydrogen Hydrogen-1 Hydrogen-2 Hydrogen-3 mass = 1
Hydrogen has three isotopes:
Hydrogen-1
Hydrogen-2
Hydrogen-3
Hydrogen-1
Hydrogen-2
Hydrogen-3
mass = 1
1 proton
0 neutrons
Atomic # =1
Atomic # =

18. Bohr Model vs. Rutherford Model

19. What is an energy level?

20. Energy Levels and the Atom
Energy Level Diagram

21. Important Energy Level Rules
Potassium - 19 total electrons
1 level rd level - 8
2nd level th level - 1

22. The Electron Cloud Model

23. Atomic Orbitals

24. Can we see atoms?

25. STM Images of an Atom