The charge on electron was discovered by
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The charge on an electron was discovered by Robert A. Millikan through his famous Oil Drop Experiment conducted in 1909. This experiment measured the electric charge of a single electron, which was found to be approximately 
coulombs.
• J.J. Thomson discovered the electron but did not measure its charge.
• Niels Bohr developed the Bohr model of the atom.
• James Chadwick discovered the neutron.
Thus, the correct choice is Millikan.
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