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influential Ancient Greek philosopher that is remembered today for his formulation of the atomic theory, first to use "atomos" the smallest particle of matter that cannot be divided
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He believed in four elements air, earth, water, fire. He felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of matter
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Law of Conservation of Mass-- which states mass cannot be created or destroyed. He said the mass of reactants will equal mass of products.
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Discovered Law of Definite Proportions-- a chemical compound contains the same elements in exactly the same proportions by mass
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English Chemist/Schoolteacher. Discovered the Law of multiple proportions-- if compounds are composed of the same elements, the masses of the elements can be expressed as ratios of whole numbers.
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Figured out that electrons had a negative charge with the Cathod Ray Tube.
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oil drop experiment. figured out the mass of electrons
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Gold Foil Experiment. Discovered nucleus was very small and very dense. Also, discovered a proton was a positive charge.
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Danish physicist who worked with Rutherford. Theory explained how the electrons moved around the nucleus. Electrons moving around nucleus can only follow certain orbits.
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English physicist who worked with Rutherford. He discovered the neutron