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Millikan’ Oil Drop Experiment
Investigation led to determining the charge of the electron.
Charge on an electron (–)1.60 × 10–19 C
charge × (mass/charge) = mass
–1.60 × 10–19 C x (1 gram/1.76 × 108 C) = 9.10 × 10–28 grams
Thomson’s experiments determined that the mass of one electron would be 2000 times lighter than a hydrogen atom.