Science Museum, London
Science Museum: Online Stuff: Atomic Firsts
Read about three famous British atomic physicists, each of whom won a Nobel Prize. J.J. Thompson discovered the electron, Ernest Rutherford successfully split an atom, and George Paget Thomson proved that electrons had wave-like properties.
Other
American Institute of Physics: Discovery of the Electron
Use this resource to read about the "Experiments by J.J. Thomson in 1897 [which] led to the discovery of a fundamental building block of matter." This exhibit is organized into several sections, including: "Mysterious Rays" and "1897...
Nobel Media AB
The Nobel Prize: J. J. Thomson Biographical
Read this detailed Nobel E-Museum biography which includes information on the scientific world of Joseph John Thomson, which gained world-wide recognition and earned Thomson the Nobel Prize in Physics.
Nobel Media AB
The Nobel Prize: J. J. Thomson Nobel Lecture: Carriers of Negative Electricity
At this site from The Nobel Foundation you can download and read Joseph John Thomson's Nobel Lecture, "Carriers of Negative Electricity" (in pdf format).
Frostburg State University
General Chemistry Online: Atoms & Ions
This site from the General Chemistry Online of the Frostburg State University provides a review of the history of atomic theory, the discovery of the electron, and the discovery of the nucleus. Details on weighing atoms, ion charges,...
National High Magnetic Field Laboratory
Magnet Academy: Joseph John Thomson
Joseph John Thomson, better known as J. J. Thomson, was a British physicist who first theorized and offered experimental evidence that the atom was a divisible entity rather than the basic unit of matter, as was widely believed at the...
Famous Scientists
Famous Scientists: J. J. Thomson
Learn about the life and scientific inventions and discoveries of J. J. Thomson.
Concord Consortium
Concord Consortium: What Are Nature's Building Blocks?
Activity 2 of the module explores: If you can't see it, how do you know it's there? Activities include the concepts of J.J. Thomson, electrons, and the Plum Pudding Model of the Atom.
Other
Chemtopics: Development of Modern Atomic Theory [Pdf]
A summary of the achievements of J. J. Thomson, Ernest Rutherford, Niels Bohr, and Erwin Schrodinger.
Stanford University
Stanford Encyclopedia: j.j. Thomson and the Electron
This site from the Stanford Encyclopedia of Philosophy offers a historical review of the discovery of the electron by J. J. Thomson and how he came to his conclusions performing experiments witha cathode ray tube.
Frostburg State University
General Chemistry Online: Discovery of the Electron
This site from General Chemistry Online of the Frostburg State University provides an explanation of Thomson's discovery of the electron using a cathode ray tube and also his plum cake model of the atom.
Wikimedia
Wikipedia: Electron
At this Wikipedia site, properties and characteristics of electrons are discussed in this brief overview of them.