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Ancient Atomos Theory -
Worked with Leucuppis that atomos were specific to materials that it composed.

(The universe was composed of 2 factors: Atoms and the void that they roam within.

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Solid Sphere Model -
"Atoms are indivisible"
- Compounds are combinations of different atoms
- Atoms of a given element are identical

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Plum Pudding Model -
- Atom composed of electrons throughout a spherical cloud of positive charge.

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Oil Drop Experiment -
Suspended tiny charged drops of oil between two metal electrodes by balancing downward gravitation force with upward drag.

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Nuclear Model -
- Forced positively charge particles at thin sheet of gold foil
- Majority of particles weren't reflected as much as others
- Positive charge was localized in the nucleus

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Planetary Model -
- Modified Rutherford's model by stating that electrons orbit around the nucleus

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Quantum Mechanical Model -
- Enforced beryllium atoms with alpha particles and an unknown substance was created.