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chemistry history of atom chpt 3
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Democritus
atoms = indivisible
Aristotle
matter is continuous and can be divided infinitely into smaller particles
was wrong
Antoine Lavoisier
law of conservation of mass
Joseph Proust
law of definite proportions (ratio is always going to be 2 H to 1 O)
Dalton
atomic theory
1. law of multiple proportions (CO, CO2) / law of definite proportions (formula)
2. all elements are made up of indivisible atoms (WRONG)
3. law of conservation of mass
4. atoms of one element differ in properties from atoms of another element
5. all atoms of a give element are the same (WRONG b/c of isotopes)
Crooke
Crooke's tube (cathode ray tube)
rays deflected away from negatively charged magnet--> cathode rays are negatively charged particles
discovered electron
Thomson
discovered proton
determined ratio of charge to mass
Plum Pudding Model
Millikan
Oil Drop Experiment
measure charge of electron
Rutherford
Gold Foil Experiment
bombarded gold foil with positively charged alpha particles
most went through foil, but few were deflected
atom mostly empty space
nucleus = dense core with positive charge
knew there was another particle in nucleus b/c mass was too large
Chadwick
discovered neutrons
Marie Curie
discovered radiation
nuclear force
optimum distance for attraction between forces in nucleus
electrostatic attraction
attraction between electron and proton
Author
kelly
ID
257029
Card Set
chemistry history of atom chpt 3
Description
chpt 3
Updated
1/17/2014, 7:06:41 AM
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