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Aristotle found out that all matter is made of 4 elements earth,air,fire,water (400 B.C)

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Democritus believed that atoms where small and that they all came in different shapes and sizes while nobody believed him (400 B.C)

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in 1809 john daltons theories where all based on observations and experiments.john dalton said that atom cannot be destroyed nor created.all atoms in an element are identical and have the same mass

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in 1897 J.J Thomson used a cathode ray tube and a vacuum where air would be pumped out and limited getting in.His method was one he made himself called plum pudding

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in 1910 Ernest continued Thomson's work.he used thin gold foil sheets and radioactive material which released alpha participials which glow when comming in contact with the fluorescent screen

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chadwick in 1932 discovered the last atomic partical now it was very difficult to find because it hd a neutral charge

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Niels was a danish chemist who made this model in 1913 in the model the protons are located in the nucleus and the electrons are located in the pathways around the nucleus

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the made the electron cloud model in 1926 in the model there is no set pathway because they have enough wiggle room because you cannot predict the location of an electron