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First person to propose the idea that matter was not infinitely divised. He believed matter was made up of tiny individual particles called atoms. He believed that atoms can not be created, destroyed, or further divided.
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Here is the timeline in which the Atomic Theory was developed.
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French chemist whose persistance in percise experiments led to the law of conservation of mass. He was the first to announce that air was made up of two gases- oxygen an nitrogen.
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States that mass is neither created nor destroyed during a chemical reaction but is conserved.
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Discovered Atomic Theory.
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Was based on the premise that the atoms of different elements could be distinguished by differences in their weights.
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Russian chemist who divised the original periodic table of the elements.
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an electric current passed through a gas inside a sealed tube. The ray would bend away from a negative field.
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discovered the electron, a negatively charged particle more than two thousand times lighter than a hydrogen atom.
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an atom made of thousands of electrons would have a very high, negatively electric charge. This was not observed, as atoms are usually uncharged.