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demorcritus was the first to have a different idea of what stuff was made of. he theorized that all stuff is made up of matter and he called it aotmos

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John dalton found out that it is one element and not four that make up the world

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j.j. thomson found out that there was electrons by the nucleus

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there are two types of radiation alpha and beta particles coming from uranium and he shot it at a little thing of gold foil

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a theory for the hydrogen atom

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he found out that they are not rotating around the nuclues