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Proposes the four element theory: earth, air, fire & water
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Originally came up with the atomic theory
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Published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method.
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Published "The Sceptical Chymist" which was a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistry
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Discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air
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wWote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals
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Developed a table of atomic weights & introduced letters to symbolize elements
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Arranged the known elements in order of atomic weights & observed similarities between some elements
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Develops an early version of the periodic table, with 28 elements organized by valence
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Produced a table based on atomic weights but arranged 'periodically' with elements with similar properties under each other. His Periodic Table included the 66 known elements organized by atomic weights.
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Discovered the Noble Gases.
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Isolated radium and polonium from pitchblende
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Discovered the source of radioactivity as decaying atoms
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Determined the atomic number of each of the elements and modified the 'Periodic Law'