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Democritus first suggested the existence of an atom.
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States that an object's mass will stay constant over time.
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All matter is made of atoms. Atoms are indivisible and indestructible.All atoms of a given element are identical in mass and properties Compounds are formed by a combination of two or more different kinds of atoms.A chemical reaction is a rearrangement of atoms. - Daltons atomic theory
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Dmirti first rearranged 63 elements on the Periodic table, fixing their position.
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Established that the plum pudding is not exactly true when alpha particles are put through a piece of gold foil.
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J.J Thomson's plum pudding model stated that negative charges were surrounded in a positively charged sort of "puddle".
His Cathode ray experiment discovered the electron. -
Corrected the positioning of elements on the periodic table.
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Established that electrons orbit the nucleus of an atom similar to planets orbiting the sun.
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Stated that electron cannot be found in one spot for any amount of time and involves quantum numbers
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The electron cloud model stated that electrons are in a cloud and cannot be pinpointed to one spot, but where they could be.
