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Believed that matter could be broken into small indivisible particles and named them atoms. (The timeline doesn't allow BC dates)
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At some point in his life, he worked on the medicinal application of minerals.
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Sometime in his life, Georg Baur developed specific metallurgy, which is the extraction of metals from their ores.
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He published a book, The Skeptical Chemist, in 1661 about the carefully measured relationship between between the pressure and volume of air. He also said that elements could not be broken into simpler substances.
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He used combustion to discover oxygen gas and also discovered carbon dioxide to be used in seltzer.
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At some point in his life, he discovered that mass is neither created nor destroyed (Law of Conservation of Mass). He published the first modern textbook in 1789.
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At some point in his life, he discovered that a given compound always contains exactly the same proportion of elements by mass (Law of Definite Porportions).
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He discovered the Law of Multiple Proportions. His atomic theory was published in 1808. He also made the first periodic table of atomic mases.
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He proposed that at the same temperature and pressure, equal volumes of different gases contain the same number of particles.
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He worked on the system of giving compounds chemical formulas.
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He discovered 4 elements, including selenium. He came up with a simple way of symbolizing th eelements and the chemical formulas.
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He used the cathode ray tube experiment to discover the electron. He determined the charge to mass ratio of the electron. He theorized the atom with the plum pudding model.
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Using th eoil drop experiment with x-rays, he determined the magnitude and mass of the electron.
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He discovered radioactivity accidentally by leaving uranium with photographic paper.
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Using th egold foil experiment, he discovered that the plum pudding model was not accurate because he discovered that the atom has a positively charged nucleus.