PLUM PUDDING MODEL - ATOMS BY:JJ THOMSON.pdf

atoms

1. PLUM PUDDING
MODEL BY JJ
THOMson
May, Sydney, Ryan, Peter

2. HOW WAS IT
DISCOVERED
J.J. THOMSON DISCOVERED
ELECTRONS IN ATOMS USING
CATHODE RAY TUBES. HE
SUGGESTED THE PLUM PUDDING
MODEL, WHERE ELECTRONS ARE
SPREAD THROUGHOUT A POSITIVE
"SOUP."

3. who discovered
it
jj Thomson
(1856-1940)
J.J. THOMSON WAS A BRITISH
SCIENTIST BORN IN 1856 WHO
DISCOVERED THE ELECTRON,
CHANGING OUR VIEW OF ATOMS. HE
PROPOSED THE PLUM PUDDING
MODEL IN 1897, WON THE NOBEL
PRIZE IN 1906, AND TAUGHT MANY
STUDENTS. HE DIED IN 1940.

4. when was it
discovered?
THE FIRST DIRECT EVIDENCE OF
ATOMS COMES FROM ROBERT
BROWN, A SCOTTISH BOTANIST. IN
1827, HE SAW TINY POLLEN GRAINS
MOVING RANDOMLY IN WATER. THIS
MOVEMENT, CALLED BROWNIAN
MOTION, CAN BE OBSERVED IN ANY
SMALL PARTICLES IN A LIQUID.

5. what is a plum
pudding model?
THE PLUM PUDDING MODEL
COMPARES AN ATOM TO PUDDING,
WITH NEGATIVE ELECTRONS MIXED
INTO A POSITIVE BASE. J.J.
THOMSON PROPOSED IT IN THE
LATE 1800S, BUT LATER RESEARCH
SHOWED THAT ATOMS ARE MORE
COMPLEX.

6. POSITIVELY CHARGED
MATTER
NEGATIVE ELECTRON
What are its components?

7. how does it
work?
THE PLUM PUDDING MODEL SAYS THAT AN ATOM IS LIKE A PUDDING WITH
BITS OF FRUIT IN IT.
1. **POSITIVE BASE**: THE PUDDING IS POSITIVELY CHARGED AND HOLDS
EVERYTHING TOGETHER.
2. **ELECTRONS AS PLUMS**: THE BITS OF FRUIT ARE THE NEGATIVELY
CHARGED ELECTRONS, SPREAD THROUGHOUT THE PUDDING.
3. **BALANCE**: THE POSITIVE CHARGE BALANCES OUT THE NEGATIVE
CHARGE OF THE ELECTRONS, MAKING THE ATOM NEUTRAL OVERALL.
THIS IDEA WAS IMPORTANT FOR SHOWING THAT ATOMS HAVE SMALLER
PARTS, BUT LATER SCIENTISTS FOUND THAT ATOMS ARE MORE COMPLEX
THAN THIS MODEL SUGGESTS.

8. THANK YOU FOR
LISTENING