1. Atomic Theory Agenda  What do you know about the atom? (whiteboard review)  Song – Atomic Theory Polka  Reading 4.2 & 4.3  Notes

2. What do you know about the atom?  Who was Democritus?  What did he contribute to the model of the atom?  Who came up with the atomic theory?  What were his four points?

3. Mn manganese

4. scandium Sc

5. Fe iron

6. titanium Ti

7. Co cobalt

8. vanadium V

9. Ni nickel

10. chromium Cr

11. Cu copper

12. zinc Zn

13. Song Time

14. Atomic Theory Polka  Dalton, Thomson, Rutherford and Bohr. Schrödinger and Heisenberg, and many, many more. Used their brains to venture in the realm of inner space and found the world of the atom was a weird and wondrous place.

15.  Dalton did experiments and said, “I think it’s clear, atoms are tiny indestructible spheres.”

16.  Thomson worked with cathode rays and said, “I disagree. A plum-pudding model makes much more sense to me.”

17.  A new chapter in atomic theory started to unfold when Rutherford played around with atoms made of gold. When a few of his alpha particles came bounding back, he hypothesized a nucleus had knocked them off the track.

18.  Dalton, Thomson, Rutherford and Bohr. Schrödinger and Heisenberg, and many, many more. Used their brains to venture in the realm of inner space and found the world of the atom was a weird and wondrous place.

19.  Bohr saw spectral lines for hydrogen and said, “It seems to me.. Electrons move in orbits with specific energies.”

20.  Heisenberg said, “Forget it, there’s no way to know the orbit or a path, where the electron’s gonna go.”

21.  Schrödinger used lots and lots of fancy mathematics, and made a model of the atom based on quantum mechanics. It has orbitals and those are based on probability. The atom is a fuzzy blob of pure uncertainty.

22.  Dalton, Thomson, Rutherford and Bohr. Schroedinger and Heisenburg, and many, many more. Used their brains to venture in the realm of inner space and found the world of the atom was a weird and wondrous place.

23. Read 4.2 – 4.3 in a 6 inch voice  Fill out the study guide as you read in complete sentences.  Use your own words! It will help you to remember more.

24. Atomic Theory Part II Date:

25. JJ Thomson  Found electron  Used cathode ray tube  “Plum Pudding” or “Chocolate Chip Cookies” model

26. Robert Millikan  Determined the electrical charge of electron  “Oil Drop Experiment”  Still plum pudding model

27. Eugen Goldstein  Found the proton  Reverse cathode ray tube  Still plum pudding model

28. Ernest Rutherford  Found nucleus  Gold foil experiment  Atom is mostly empty space – first nuclear model

29. James Chadwick  Found neutron  Shot alpha particles at Be nucleus  Nucleus is made of two particles Positive protons Neutral neutrons

30. Niels Bohr  Planetary model  Proposed electrons have a set amount of energy putting them in different energy levels, or orbits around the nucleus.  Electrons can change energy levels; higher energy levels are further from the nucleus.

31. Heisenberg’s uncertainty principle  Heisenberg’s uncertainty principle: cannot know exactly both the velocity and position of electron at the same time.  Like trying to catch a helium balloon in the dark.

32. Schrödinger  Electron cloud gives a 90% probability of finding the electron within the darkly shaded area.  Electrons move like moths around a light – unpredictable.

33. Homework  Last element quiz FRIDAY!