Editing Notes On Millikan, Goldstein, Chadwick And Subatomic Particle Data

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English J. J. Thomson (1856-1940) 
*Discovered electron (negatively charged particle
*Charge to mass ratio of e- is constant, this means only one type of electron
*From results of his experiment, Plum pudding Model of Atom
 
American Robert Millikan (1868-1953) 
*Determined actual charge and mass of e-, mass of electron = 9.11E-28 g
*Used a sensitive oil dropping equipment
*Discovery made in 1909 
 
German Eugene Goldstein (1850-1930) 
*Discovery of proton (some people dispute this)
*When, about same time as electron, also disputed
 
English James Chadwick (1891 – 1974)
*Discovery of neutron, 1932
 
Subatomic Particle Data 
*Proton (p+), positively charged, mass = 1.67E-24 g, located in nucleus
*Neutron (n0), neutral charge, mass = 1.67E-24 g, located in nucleus
*Electron (e-), negatively charged, mass = 9.11E-28 g, located outside nucleus
**electron mass is approximately 1/2000 mass of proton or neutron (actually is 1/1840) 
*Note: Yes, these subatomic particles are made up of even smaller particle, but that is for physic to explain NOT chemistry.

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