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The Atom

Discovery of the Atom and subatomic particles

What 2 chemicals are used to demonstrate the particulate nature of matter? Ammonia and Hydrochloric Acid
3 ideas proposed by John Dalton: 1: All matter is made up of atoms 2: These atoms are indivisible 3: They cannot be created or destroyed
Discovered Cathode rays William Crookes
Discovered Cathode rays were made up of negative particles JJ Thomson
Discovered the quantity of the charge on an electron Robert Milikans
Thomson's Plum Pudding Theory Atoms consisted of a large positive sphere with negative electrons embedded in it.
Discovered the Nucleus Ernest Rutherford
Type of radiation Rutherford used, firing it at what metal? Alpha radiation at gold foil
Rutherfords new model of the atom Rutherford proposed the atom was made up of mainly empty space with a solid positive core at its nucleus.
Discovered the Proton Also Ernest Rutherford
Discovered the Neutron James Chadwick
Radiation used by Chadwick, firing at what metal? Alpha particles at Beryllium
Mass of an electron 1/1838
Created by: cbschemistry



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