J.J. THOMSON BY CARLEE HERRIN

• joseph John Thomson
• Was born in Cheetham Hill England on Dec 18, 1856
• Studied mathematics at Triniy college
• Age 28 became a professor of physics
• His focus was the study of atomics

MAIN FOCUS & STUDIES

• Discovered the electron in 1897
• His theory was that the atom was made up of small particles
• J.J. proved his theory by using the cathode ray tube.

problems

• the problem with this model was that it consisted of a base of
• protons on with the elections were enclosed by chance. This model
• was obviously wrong as it didn't explain the neutrality of an atom nor did it
• explain why atoms undergo reaction.

MAIN DESIGN

EVIDENCE

• IF GAS IS INTRODUCED INTO THE REGION BETWEENTWO
• CHANGED PLATES. A CURRENT FLOW CAN BE OBSERVED.
• SUGGESTING THAT THE ATOMS HAVE BEEN BROKEN DOWN.

New theory

• charged particles could be
• deflected in a magnetic
• field

DIFFERENCEs

• He thought the rays could be separated but now he says
• they cant be.

NEW THEORY.