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The Alchemists developed the theory that all metals are made of mercury and sulfur, and that it is possible to change base metals into gold. -
Democritus discovered the atom
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Plato discovered that atoms mathematically break down into geometric shapes.
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Boyle helped develop the definition of an element
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Lavoisier came up with the law of conservation of mass which states that matter changes forms but cannot be created nor destroyed
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The billiard ball model of an atom was a model in which an atom is represented as a tiny indivisible spherical object that cannot be more simplified. -
Dalton's Atomic theory states that all matter is composed of atoms and that atoms of each element are the same mass and properties but differ from that of other elements. It also states that atoms cannot be subdivided nor destroyed. -
Avogrado discovered that elements could exist as molecules which were comprised of multiple atoms joined together.
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Mendeleev created the periodic table
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Einstein is famous for the theory of Relativity in which special relativity applies to elementary particles (electrons) and their interactions
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Thompson discovered the electron.
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The Curies discovered polonium and radium which are radioactive elements.
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The plum pudding model of an atom is electrons surrounded by a volume of positive charge.
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Millikan discovered the value of the charge of an electron.
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Rutherford discovered the nucleus of an atom.
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Bohr proposed the theory for the hydrogen atom and discovered that electrons do not come into contact with the nucleus of an atom. He also created the solar system model of the atom.
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The solar system model of an atom is a model in which there are electron in orbit around a nucleus similar to the way planets orbit around the sun.
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Moseley discovered the atomic number of each element which led to the accurate organization of the periodic table.
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Heisenberg calculated the behavior of electrons which circle around the nucleus of an atom using the uncertainty principle.
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Schrodinger created the equation that can pinpoint the placement of electrons. This made it possible to make very accurate models of atoms.
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The electron cloud model of an atom is a model in which the atom consists of a nucleus surrounded in a cloud of rapidly moving electrons.
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Chadwich discovered neutrons.
