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-Hypothesized atoms
-No experiments (thought)
-Atom was made of 4 basic elements (Fire, Water, Land, Air)
-Matter is made of atoms
-Cut smaller and smaller units of matter to get to the smallest unit possible

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-The Billiard Ball Model
-Compounds were combos of different elements
-All Elements consist of atoms

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-Chocolate Chip Cookie Model & Plum Pudding Model
-Discovered electrons

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-Nuclear Model
-Most mass is in the nucleus
-Empty space of atom contains electrons

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-The Planetary Model
-Electrons orbit the nucleus
-Electrons in specific energy levels

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-The Quantum Model
-Cloud represents were electrons could be
-Impossible to show locations and speed of electron

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-Current Model