Biography
In what year was J. J. Thomson born?
1856
What particle did J. J. Thomson discover?
The electron
What was the name of Thomson’s atomic model?
(The Plum Pudding Model)
What role did J. J. Thomson have at Cambridge University?
(Professor and director at the Cavendish Laboratory)
Where was J. J. Thomson born?
Cheetham Hill, Manchester, England
What experiment did he use to discover the electron?
Cathode ray tube experiment
In his model, what represented the electrons?
(The raisins or plums)
What simple demonstration can show how negative charges behave, like electrons?
(Balloon and static electricity, or paper attraction)
What subject did Thomson study at university?
Physics
In what year did he discover the electron?
1897
Why are there no photos of Thomson’s model?
(It was a theoretical idea, not a direct experiment)
Why was Thomson’s discovery of the electron so important?
(It revolutionized the understanding of atomic structure)
At which famous university did he work most of his life?
Cambridge University
When Thomson placed electric and magnetic fields around the cathode ray, which way did the beam bend?
Towards to the positive plate
What was revolutionary about his model compared to earlier ideas of the atom?
(It showed atoms had internal structure with negative charges inside a positive background)
What did J. J. Thomson originally call electrons?
(Corpuscles)
In what year did J. J. Thomson die?
1940
Who discovered positive rays, showing that atoms also contain positive charges?
(Eugen Goldstein)