J.J. Thomson
Sarah Badlis, Jose Melvin Calleja and Bailey Gaul
Previous Model
Dalton concluded that atoms were
solid spheres.
Thomson wanted to find out the
subatomic structure.
Experimental Design
Cathode tube
Vacuumed discharged tube
Two parallel anode plates
Shot a cathode ray through the tube
Cathode ray was seen by its green glow
Ray traveled in a straight line
Placed materials into the tube to affect the ray
Two magnets- Created a magnetic field
Thomson’s Conclusions
Electrons traveled in straight lines
Cross’s shadow
Electrons have momentum and kinetic energy
Wheel spinning
Electrons produce heat when they strike
Platinum strip
Electrons are negative
Based off of his experiment, J. J. Thomson’s “Plum Pudding” atom has a positive
charge which contains negative electrons.
Interesting Information
Thomson won a Nobel Prize in Physics in 1906.
Before the outbreak of World War I, Thomson
made an extraordinary discovery: the isotope.
Thomson died on August 30, 1940 and was buried
in Westminster Abbey, near Isaac Newton.
Bibliography
http://www-outreach.phy.cam.ac.uk/camphy/nucleus/nucleus1_1.htm
https://en.m.wikipedia.org/wiki/J._J._Thomson
http://www.atomicarchive.com/Bios/Thomson.shtml
http://atomictimeline.net/index.php
http://www.tutorvista.com/science/jj-thomson-atomic-theory-0
https://suite.io/isaac-m-mcphee/mff2y0