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first crusade
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100 year war
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French and Indian War
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Antonie Lavosier The law states that matter cannot be made or destroyed
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Joseph Proust Law of Definite Proportions This law states that a compound is composed of exact proportions of elements by mass regardless of how the compound was created. For example, to make water there is a specific ratio of grams of hydrogen to grams of oxygen regardless of where your sample of water was found. All water has this particular proportion
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french american war
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John Dalton first atomic theorists //// had a theory that was supported by experimental data and supported the law of conservation of mass atom cannot be created or destroyed but rather rearranged
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Amedeo Avogadro equal volumes of different gases contain an equal number of molecules, provided they are at the same temperature and pressure.
His hypothesis was rejected by other scientists. It only gained acceptance after his death. It is now called Avogadro’s law.
He was also the first scientist to realize that elements could exist in the form of molecules rather than as individual atoms -
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William Crookes discovered the electron with the cathode ray tube( he didnted know there were electrons yet
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Henri Becquerel discovered radioactivity
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J.J. Thomson he also experimented with cathode rays and was given created for finding the electron
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Max Planck originator of the quantum theory of energy
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Madame Curie she was famous for her x-ray units she pioneered it
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Robert Millikan oil drop experiment helped to quantify the charge of an electron, which contributed greatly to our understanding of the structure of the atom and atomic theory
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Ernest Rutherford discovered the nucleus of the atom
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Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers. This was the theory of special relativity
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Henry Moseley he figured out that every element has a different number of protons
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Erwin Schrodinger combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom
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James Chadwick discovered the neutrons
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louis de broglie French physicist best known for his research on quantum theory and for predicting the wave nature of electrons
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Werner Heisenberg his theory ofquantum mechanics, published in 1925, when he was only 23 years old. For this theory and the applications of it which resulted especially in the discovery of allotropic forms of hydrogen
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Niels Bohr In 1913, Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.
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