Discovery of the Atom and subatomic particles
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What 2 chemicals are used to demonstrate the particulate nature of matter? | Ammonia and Hydrochloric Acid
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| 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
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| Discovered Cathode rays | William Crookes
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| Discovered Cathode rays were made up of negative particles | JJ Thomson
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| Discovered the quantity of the charge on an electron | Robert Milikans
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| Thomson's Plum Pudding Theory | Atoms consisted of a large positive sphere with negative electrons embedded in it.
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| Discovered the Nucleus | Ernest Rutherford
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| Type of radiation Rutherford used, firing it at what metal? | Alpha radiation at gold foil
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| 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.
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| Discovered the Proton | Also Ernest Rutherford
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| Discovered the Neutron | James Chadwick
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| Radiation used by Chadwick, firing at what metal? | Alpha particles at Beryllium
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| Mass of an electron | 1/1838
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