Atoms are made up of electrons that orbit around a small, positively charged nucleus. J.J. Thomson discovered that electrons come from atoms and are much smaller than atoms. Rutherford found that atoms are mostly empty space by shooting radioactive particles at atoms and observing some bounce off, indicating a small, dense nucleus. Bohr incorporated Rutherford's nuclear model and proposed that electrons can only orbit in certain fixed distances from the nucleus, known as orbitals.

1. ATOMS
Day 3
Thomson
Rutherford
& Bohr

2. ELECTRONS
Atoms can be divided

3. ELECTRICITY
What is it made of?

4. CATHODE RAY TUBE
Strange effects http://www.youtube.com/watch?v=5gGddyFz3aQ

5. STILL USED
Fluorescent bulbs and TV’s

6. J.J. THOMSON
Put it all together

7. OBSERVATIONS
Electrons come from atoms
in metal
Flow through CR Tube
Magnets deflect (– charge)
2000x smaller than smallest
atom (mass)

8. PLUM PUDDING
Theory: Electrons spread evenly in squishy atom

9. NUCLEUS
Atoms are mostly empty space

10. ERNEST RUTHERFORD
It’s all about the Rutherfords

11. RADIOACTIVE
Shoot out particles

12. SQUISHY ATOMS?
Shoot stuff at it http://scratch.mit.edu/projects/dapontes/185225

13. SURPRISE!
Some particles bounce back

14. NUCLEUS
100,000 x smaller than atom
+ charged center

15. NUCLEUS
Rutherford
Shoot radioactive stuff at atoms
Bounces off something small
Positively charged
Electrons orbit

16. ORBITS
Rules for where electrons go

17. NIELS BOHR
As in boring – he’s Dutch

18. SPLIT LIGHT
Different elements give off different colors

19. LANES
Light released when electrons
drop to lower orbit

21. ORBITALS
Bohr
Different elements give
off different colors
Energy is released as
light
Electrons orbit

22. CLOUDS
Electrons not actually on paths http://www.youtube.com/watch?v=5gGddyFz3aQ

23. ATOMS
Have electrons (– charged)
Have nucleus (+ charged)
Have orbitals (lanes for electrons)

24. BIBLIOGRAPHY
http://upload.wikimedia.org/wikipedia/commons/9/92/Pile_de_Volta.jpg
http://www.flickr.com/photos/toastforbrekkie/866114974/sizes/m/
http://www.flickr.com/photos/kristofor808/3408333283/sizes/l/in/set-72057594056034692/
http://www.flickr.com/photos/ladesign/4197918856/
http://www.flickr.com/photos/23325821@N04/4087596160/
http://crescentcityshapers.files.wordpress.com/2010/01/52831195_0504060006.jpg
http://www.flickr.com/photos/ca_heckler/4087181226/sizes/l/