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year of discovery- 1913
discovery- radiation is released when an electron moves from one orbit to another.
experiment- he created an atomic model showing the different orbits of the electrons

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year of discovery-1899
discovery- uranium emits fast moving particles that have a positive charge.
experiment- found out what happened when alpha particles passed through a thin sheet of gold.

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year of discovery- 1897
discovery- the electron
experiment- used a Cathode Ray tube to demonstrate that cathode rays were negatively charged.

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Year of discovery- 1803
discovery- All matter is made up of atoms. Atoms are invisible and indestructible.
experiment- Dalton wondered how air and water can exist in the same place at the same time.

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year of discovery- (c.460- c.370 bc)
discovery- His discovery was of the atom
Experiment- He cut on object in half until he couldn't anymore and showed matter cant be broken down any farther.