J.J. Thomson discovered electrons in 1897 using a cathode ray tube, which showed that cathode rays were streams of electrons. He proposed the plum pudding model of the atom, which depicted the atom as a ball of positive charge with negative electrons embedded inside. This contradicted Dalton's model of individual solid spheres, leading Thomson to disprove Dalton's model of atomic structure.

1. JJ Thomson: the PLUM PUDDING MODEL!!! Michelle Kao Elysia Hung

2. Plum pudding is not too bad to eat JJ Thomson’s Plum Pudding Model is not too bad to see

3. Index!! =D J.J. Thomson Cathode Ray Tube (CRT) Cathode Rays!! And the….amazing… Plum Pudding Model!! \@/ And…the… Dalton’s Model… 

4. J.J. Thomson is a British Physicist and a Nobel Prize Winner who discovered electrons and isotopes in 1897. And Died in 1940.  Background Information

5. <-- J.J. Thomson’s true form… just kidding~

6. He used a Cathode Ray Tube (CRT)

7. Vacuum Tube Cathode Anode

8. Pretty~ CATHODE RAY~~

9. Then, what is a cathode ray?? The glow is actually many many many many many many many many many many many many many many many many many many many many many many many many many many many many many many ELECTRONS!

10. Electrons can pass through the CRT because there is no air in the vacuum to stop the electrons. So that the electrons won’t bump into things.

11. SO BEAUTIFUL~

12. This is one pudding’s sad, short story… Intermission~ A story about a freedom longed for, but never attained…

14. A TV or a computer screen has many cathode ray tubes to make the different colors that appear on the screen. WOOHOO!! FIGHT!!! DIE!!! DIE!!!

15. Same charges repel, and opposite charges attract.

16. Magnet The ray arcs away from the magnet

17. A ball of positive with little balls of negatively charged particles inside~~ The Plum Pudding Model

20. Dalton’s Model Dalton believes that an atom is a solid ball. Each elements are different shaped balls since each atom has a different property.

21. Thomson switch the cathode and anode with different metals and found out that they all create a cathode ray. He concluded that whatever is present in an atom is also in all the other atoms. (electrons~)

22. SUMMARY TIME!! YAHOO! J.J. Thomson discovered electrons in 1897. Cathode Ray Tubes are vacuums with cathode and anode. The ray arcs away when a – magnet is close by. Plum pudding model is a ball with electrons stuck in it. He disproved Dalton’s Model.

23. Farewell! Thanks for watching! Bye bye!