Ch2ppl - Goal: find the charge on the electron to determine...

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John Dalton: – Each element is composed of atoms – All atoms of an element are identical. – In chemical reactions, the atoms are not changed. • Compounds are formed when atoms of more than one element combine. • Dalton’s law of multiple proportions: When two elements form different compounds, the mass ratio of the elements in one compound is related to the mass ratio in the other by a small whole number. Thompson: Cathode rays – voltage cause e to travel from neg to pos; deflection reveals charge to mass ratio to be 1.76 e 8 C/g.
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Unformatted text preview: Goal: find the charge on the electron to determine its mass Milikan: Oil Drop - When a drop is perfectly balanced, the weight of the drop is equal to the electrostatic force of attraction between the drop and the positive plate. determined the charge on the electron to be 1.60 e -19 C. Found mass of electron - 9.10X10-28 g Rutherford: Gold Foil proved Thompsons Plum-Pudding wrong; atom is spherical but pos charge is center small and dense, neg surround it...
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This note was uploaded on 04/27/2008 for the course CHEM 1311H taught by Professor Robinson during the Spring '07 term at University of Georgia Athens.

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