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He declared that there were only four elements of matter being fire, air, water and earth and all matter is made up of these elements. He also said that matter had four properties that were hot, cold, dry, and wet.
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Atoms are solid homogeneous, indestructible, and indivisible. Different atoms have different shapes and sizes.
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Bartolomeo Cristofori
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He disproved the idea of the phlogiston theory and stated the Law of Conservation of Mass. Developed a system of naming chemical compounds and named the element hydrogen. He discovered that water was a compound and not an element which was popular belief. He also wrote the first chemistry textbook.
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Developed the law of definite proportions
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Edward Jenner https://www.youtube.com/watch?v=Zcftgu1Dwk4
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Developed Dalton's atomic theory. Also said that all atoms of an element are identical with the same size, mass, and chemical properties. Atoms combine to form compounds and in a chemical reaction, atoms are separated, combined, or rearranged.
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War between the United States and Great Britain
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Developed Avogrado's Law.
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Assassination of Abraham Lincoln
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Discovered thallium and created the "Crookes tube" which led to the discovery of cathode rays.
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Discovered the electron. He also developed a plum pudding model that proposed that negatively charged electrons were spread out in a uniform positive charge.
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Discovered spontaneous radioactivity
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Discovered polonium and radium after Henri Becquerel discovered radioactivity.
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E=mc^2, He explained the photoelectric effect, that electromagnetic radiation has both wavelike and particlelike natures which explains photons.
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Accurately determined the charge carried by an electron using the "falling-drop method," and verified Einstein's E=mc^2
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He set up an experiment that led him to discover the nucleus and to disprove Thomson's plum pudding model of the atom.
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He discovered that atoms of each element contain a unique positive charge in their nuclei. He developed a more accurate positioning of elements in the periodic table by determining their atomic numbers.
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Discovered concept of the energy quanta: the emitted radiation consists of quanta specific energies determined by the Planck constant
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Developed Bohr's Theory, which could explain why atoms emitted light in fixed wavelengths
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Developed his uncertainty principle at age 23 which states that the better you know the position of a particle, the less you know the momentum and vice versa. This was part of the start of quantum mechanics.
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Formulated a wave-equation that accurately gave the energy levels of atoms
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Discovered the wave nature of electrons
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Discovered the neutron
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Norman Woodland
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Shiva Ayyadurai
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Jeff Bezos https://www.youtube.com/watch?v=98BIu9dpwHU
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