Scientific Discovery K.Kiesel

  • 100

    Democritus and Leucippos c.400 BC

    Believed that matter could be broken into small indivisible particles and named them atoms. (The timeline doesn't allow BC dates)
  • Period: Jan 1, 1493 to Dec 31, 1541

    Paracelsus (Philippus Theophrastus Bombastus von Hohenheim)

    At some point in his life, he worked on the medicinal application of minerals.
  • Period: Jan 1, 1494 to Dec 31, 1555

    Georg Baur

    Sometime in his life, Georg Baur developed specific metallurgy, which is the extraction of metals from their ores.
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    Robert Boyle

    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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    Joseph Priestley

    He used combustion to discover oxygen gas and also discovered carbon dioxide to be used in seltzer.
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    Antoine Lavoisier

    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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    Joseph Proust

    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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    John Dalton

    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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    Amadeo Avogadro

    He proposed that at the same temperature and pressure, equal volumes of different gases contain the same number of particles.
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    Joseph Gay-Lussac

    He worked on the system of giving compounds chemical formulas.
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    Jons Jakob Berzelius

    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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    J.J. Thomson

    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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    Robert Millikan

    Using th eoil drop experiment with x-rays, he determined the magnitude and mass of the electron.
  • Henri Becquerel

    He discovered radioactivity accidentally by leaving uranium with photographic paper.
  • Ernest Rutherford

    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.