JJ Thomson: The Plum Pudding Model

For a Science Project

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

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

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

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

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

6. He used a Cathode Ray Tube (CRT)He used a Cathode Ray Tube (CRT)

7. Vacuum Tube
Cathode
Anode

8. Pretty~
CATHODE RAY~~

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

10. Electrons can pass through the CRT Electrons can pass through the CRT
because there is no air in the vacuum because there is no air in the vacuum
to stop the electrons.to stop the electrons.
So that So that
the the
electrons electrons
won’t won’t
bump bump
into into
things.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.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 ModelDalton’s Model
Dalton believes Dalton believes
that an atom is a that an atom is a
solid ball. Each solid ball. Each
elements are elements are
different shaped different shaped
balls since each balls since each
atom has a atom has a
different property.different property.

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

22. SUMMARY TIME!! YAHOO!SUMMARY TIME!! YAHOO!
J.J. Thomson discovered electrons in J.J. Thomson discovered electrons in
1897.1897.
Cathode Ray Tubes are vacuums with Cathode Ray Tubes are vacuums with
cathode and anode.cathode and anode.
The ray arcs away when a – magnet is The ray arcs away when a – magnet is
close by.close by.
Plum pudding model is a ball with Plum pudding model is a ball with
electrons stuck in it.electrons stuck in it.
He disproved Dalton’s Model.He disproved Dalton’s Model.

23. Farewell!
Thanks for
watching!
Bye bye!