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In the late 19th and 20th centuries, the concept that the atom was indivisible began to be questioned.
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Sir Humphry Davy and Michael Faraday used electricity to decompose chemical bounds. From the Greek "elektron".
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Phenomenon first discovered by Julius Plücker
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J.J. Thomson determined the ratio of the charge of an electron (e) to its mass (m) in 1897 by experimenting with deflection of cathode rays in electric and magnetic fields.
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Wilhelm Wien and J.J. Thomson discovered it with help of Eugen Goldstein.
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Robert Millikan performed an experiment in which he used x-rays, he determined the electron's charge, which in turn allowed the electron's mass to be calculated.
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Discovered by Ernest Rutherford and coworkers.
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Sir James Chadwicj conclusively demonstrate the existence of this particle. He also determine the mass of the neutron to be 1.675x10^-24g.