JJ Thomson: the PLUM JJ Thomson: the PLUM PUDDING MODEL!!!PUDDING MODEL!!!

Michelle KaoMichelle Kao

Elysia HungElysia Hung

Plum pudding is not too bad to eatJJ Thomson’s Plum Pudding Model is not too bad to see

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…

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

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

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

Vacuum Tube

CathodeAnode

Pretty~

CATHODE RAY~~

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!

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.

SO BEAUTIFUL~

This is one pudding’s sad, short story…

Intermission~

A story about a freedom longed for, but never attained…

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!!!

Same charges repel, and opposite charges attract.Same charges repel, and opposite charges attract.

Magnet

The ray arcs away from the magnet

A ball of positive with little balls of negatively charged particles inside~~

The Plum Pudding Model

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.

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~)

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.

Farewell!

Thanks for watching!

Bye bye!