[DOC] [TLE] Discovery of the Electron: J. J. Thomson - Le Moyne [PAR] Joseph John Thomson (J. J. Thomson, 1856-1940; see photo at the Science 
Museum, ... to measure the charge-to-mass ratio of cathode rays in 1897, nor the 
first to ... way (the experiment is one made many years ago by Sir William 
Crookes[4]): A ... The arguments in favour of the rays being negatively charged 
particles are... [DOC] [TLE] J. J. Thomson - Wikipedia [PAR] Sir Joseph John Thomson OM PRS was an English physicist. He was elected as 
a fellow of the ... Thomson is also credited with finding the first evidence for 
isotopes of a .... than an atom, suggesting the subatomic particle now known as 
the electron. Thomson discovered this through his explorations on the properties 
of... [DOC] [TLE] Timeline of particle discoveries - Wikipedia [PAR] This is a timeline of subatomic particle discoveries, including all particles thus far 
discovered ... Composite particles which were the first particle discovered 
containing a particular ... 1897, Electron discovered by J. J. Thomson .... 100 (3): 
947950. .... (1996). Particle Physics: One Hundred Years of Discoveries: An 
Annotated... [DOC] [TLE] Subatomic Particles - Neutrons, Quark Model, Elementary Mediator ... [PAR] The first subatomic particle to be discovered was the electron. ... it was English 
physicist J. J. Thomson (18561940), who in 1897 measured the velocity and... [DOC] [TLE] The discovery of the electron | thecuriousastronomer [PAR] Apr 12, 2013 ... In 1897 J.J. Thomson discovered the first sub-atomic particle, the ... that 
cosmology is at the stage particle physics was about 100 years ago. [DOC] [TLE] Early Atomic Theories - Haiku [PAR] The Greek philosopher Democritus (460-370BC) was the first person to ... The 
English physicist J.J. Thomson (1856-1940) discovered the first subatomic 
particle ... measured almost 100 years ago is within 1% of the currently accepted 
value. [DOC] [TLE] History of the Atom | CK-12 Foundation [PAR] Apr 20, 2012 ... Democritus first introduced the idea of the atom almost 2500 years ago. ... than 
the Greek philosopher Aristotle, who lived about 100 years after Democritus. ... 
When later scientists discovered subatomic particles (particles smaller ... They 
were discovered in 1897 by a British physicist named J. J. Thomson. [DOC] [TLE] Unit 4 Notes - Pearland ISD [PAR] In 1897, just over 100 years ago, Sir J. J. Thomson ran an experiment that 
provided evidence that the atom is ... Discovery of Subatomic Particles (continued
). [DOC] [TLE] 100th Anniversary Of Electron's Discovery - Chemical & Engineering ... [PAR] Celebrations honor Thomson's transforming discovery of the first subatomic ... On 
April 30, 1897, British physicist Joseph John Thomson announced, ... These 
particles, which Thomson called "corpuscles," were the first subatomic particles 
ever to ... that we take for granted today, but which were inconceivable 100 years 
ago. [DOC] [TLE] Unit 4 Notes - Pearland ISD [PAR] Democritus and his mentor were the first to suggest the ... In 1799 a scientist 
named Joseph Proust discovered that compounds always contain the same 
proportion of elements ... In 1897, just over 100 years ago, Sir J. J. Thomson ran 
an experiment that provided evidence that the atom is composed of subatomic 
particles. [DOC] [TLE] Atoms facts, information, pictures | Encyclopedia.com articles about ... [PAR] The definitions of atoms and elements seems, at first glance, almost circular: an ... 
Every item of matter that exists, except for the subatomic particles discussed in ... 
exactly the opposite of what physicists believed a century ago. ..... The discovery 
of the electron raised a new question: if Thomson's particles ...... J. J. Lagowski... [DOC] [TLE] Discovery of the electron: commentary on J. J. Thomson's classic ... [PAR] The discovery over 100 years ago that cathode rays were composed of 
negatively ... demonstrating for the first time that particles smaller than atoms 
existed and initiating ... The research investigations of J. J. Thomson, leading up 
to the crucial experiments identifying the particle and ..... Acceptance of 
subatomic particles. [DOC] [TLE] Atomic Theory Models Review

Question: It was the first subatomic particle discovered 100 years ago by J.J. Thomson
Answer: Electron