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## PowerPoint Slideshow about 'Atomic Theory' - shiloh

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Democritius

- Greek Philosopher
- 4th Century
- Was the first to discover the atom.
- Concluded that it can’t be broken down.
- Aristotle and Plato didn’t agree with him.

John Dalton

- 1766-1844
- Formulated the “Atomic Theory”

JJ Thomson

- 1897
- Discovered the electron (-) while experimenting with cathrode rays.
- Estimated weight 1/1840
- Plum Pudding Model

Robert Millikan

- 1909
- The “Oil Drop” experiment.
- Measured the elementary electric charge (the charge of the electron)

Ernest Rutherford

- 1891-1974
- “Goil Foil” Experiment in 1910.
- Results: Positively charged nucleus; a small core.

James Chadwick

- 1891-1974
- Discovered the neutron in 1932.
- The neutron surrounds the nucleus.

Neils Bohr

- 1885-1962
- Neils Bohr Model (1913)
- Electrons orbit the nucleus in circular paths of fixed energy.
- N= energy levels

Quantum Mechanical Model

- Deals with subatomic particles as well as atoms, molecules, elements, compounds and much longer systems.
- Associated with the quantum theory “matter also has the properties associated with waves.”
- Used to explain observations made on complex atoms.
- Deals with mathematics.

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