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The History of the Atomic Model

Robert Milikan
Home | Wroks Cited | Timeline | Hans Geiger | Ernest Marsden | John Dalton | Walter Bothe | Sources | Lord Rutherford | JJ Thomson | Niels Bohr | Antoine Lavoisier | Robert Milikan | Democritus | Aristotle

Electron Charge

In 1909 Milikan conducted eperiments to find the electrical charge of 1 electron.  His results were inacurate and dismissed, then in 1910 he conducted the famous oil-drop experiment. 
Oil drops are given an negative charge then they fall through a metal plate.  The drops pass near an electrical current and energy passes through them.  The amount of energy to suspend the droplet plus the mass is used to determine trhe overall charge of the oil droplet and thus the charge of an electron.
Having an acurate idea of the charge of an electron gave greater insight into the make up of the atom in general, greatly adavancing the atomic theory and model.