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- 1803 was when Dalton made his theory and model
- Discovered that everything consists of atoms
- created the idea that elements are characterized by the weight of their atoms

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- Experiment was done by J.J Thomson in 1897
- Used to discover the electron
- Discovered that charged particles (electrons) are lighter than atoms

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- The model was made around 1904
- Called the Plum Pudding Model
- Each atom is filled with positively charged fluid

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- Experiment was done by Ernest Rutherford in 1908
- Used to find out that the atom is mostly empty space with a tiny, dense, positively-charged nucleus
- Almost all particles went through but some reflected back

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- Made around 1910 to 1911
- Called the planetary model
- Electrons orbit the nucleus

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- Experiment was done by Niels Bohr in 1913
- Used to show and support the planetary atom model
- Used to find out that electrons orbited the nucleus in specific orbits or shells with a fixed radius.

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- Made in 1913
- Called the Rutherford-Bohr model
- Electrons orbit the nucleus in a set path

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- Proposed around 1926
- An electron doesn't travel an exact path
- The orbit is dependent on the energy level