1. Unit 3: Atoms

2. In your science notebook: How do you think scientists discovered the nucleus of an atom? AFTER TODAY I WILL BE ABLE TO: List the main points of Dalton’s atomic theory. Explain how Thomson and Rutherford produced their atomic models. EVERYTHING IN PURPLE OR THAT HAS A PURPLE ARROW NEEDS TO BE IN YOUR NOTEBOOK!

3.  You need a notebook by today! (5 points)  Add “Jessica Racine-Teacher” on Facebook by the end of the week (5 points)  Remind your parents that conferences are next Monday and Tuesday

4.  Who discovered electrons?

5.  Period 1: 34.6%  Period 2: 56.5%  Period 3: 43.6%  Period 4: 42.2%  Period 6: 34%  Highest grade: 96%  What they did to study: reviewed all PowerPoints

6. AFTER TODAY I WILL BE ABLE TO:  List the main points of Dalton’s atomic theory and describe his evidence that atoms exist.  Explain how Thomson and Rutherford used data from experiments to produce their atomic models. WRITE ALL OF THIS IN YOUR NOTEBOOK

7. 1. DALTON 2. THOMSON 3. RUTHERFORD

8. A. Three findings 1. “all atoms of a given element are exactly alike” a. this means: atoms of one element are the same

9. A. Three findings 2. Compounds are _______ or more ____________ _________ ____________. A. Three findings 2. Compounds are two or more elements chemically combined

10. A. Three findings 3. Atoms cannot be divided

11. B. Dalton’s Model RECAP: 1.Atoms of the same element were identical 2.Atoms join to form compounds 3.Atoms cannot be divided

12. A. His experiment 1. (Describe it in your own words……) 2. Thompson discovered __________ by using the cathode ray ELECTRONS!

13. B. His model 1. PLUM PUDDING 2. - - - - - - - - - - - - 3. A blueberry muffin is similar to Thompson’s model because…

14. A. Rutherford’s experiment 1. Describe it: ***VIDEO Rutherford shot positive charged particles at gold foil. Most went through, some deflected, and some came completely straight backwards 2. Draw it:

15. A. Rutherford’s experiment 3. This proved…. that parts of atoms had a concentrated positive charge in the center a. nucleus: small center of atom that has positive charge i. If the nucleus was a marble, the atom would be the size of a football field

16. B. Rutherford’s model 1. Draw it: electrons nucleus

17.  Your group will be assigned a scientist  You must think of a creative way to explain what they did  You have 7 minutes to come up with an idea  You have ____ minutes to plan and 4 minutes to present

18. Graded on:Points: Name of scientist1 Explain experiment5* Explain findings2 Draw and explain model3 Creativity5 Productivity4 * Dalton group: see me

19. SCIENTISTYEARFINDINGSMODEL 1808 1897 1898 SCIENTISTYEARFINDINGSMODEL DALTON1808 1.Identical atoms 2.Atoms cannot be divided 3.Compounds THOMPSON1897 Electrons exist RUTHERFORD1898 Nucleus is positive in the center of an atom - - - - - - - - - - - -

20.  Answer questions 1-3  Clear everything off of your desk  THIS IS YOUR OWN WORK!  Answer in complete sentences  Pencil down when you are done

21. How did scientists discover the nucleus? Assignments: HOMEWORK 1, add me on facebook, return test SCIENCE FAIR TOPIC BY MONDAY Due when I see you next