jun 30, 1909 - Milkan (1909)
Description:
By carefully studying individual droplets, Millikan was able to show that the charge on a drop was always an integral multiple of a small, but finite value. When his data are converted to SI units, the charge on a drop is always some multiple of 1.59 x 10-19 C. Combining this value for the charge on a single electron with the charge to mass ratio for the electron confirms Thomson's hypothesis. The mass of an electron is at least 1000 times smaller than the lightest atom.
Added to timeline:
History of the Atomic Theory
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