Development of the Atomic Structure


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  • Greece, circa 400 BCE
  • Hello! I'm Democritus and I believe that all things are made of tiny particles in which I called them "atomos", and they are neither created nor destroyed.
  • England, 1803
  • Greetings! I'm John Dalton, and I proposed a theory that would recognize that all things are made of tiny indivisible particles called atoms, and all atoms of the same element have identical mass and properties.
  • England, 1897
  • Hi! I'm J.J. Thomson, and I've discovered in my Cathode Ray Tube Experiment that there are negatively charged particles in the rays, and I call them as "corpuscles" (which are later known as electrons).
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  • England, 1911
  • Hi there! I'm Ernest Rutherford, and I've found out in my Gold Foil Experiment that atoms have a nucleus that occupies the center of the atom. I've also discovered that there are positively charged particles in an atom, and that they are known as protons. I've also proposed that there's a 3rd particle existing in an atom.
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  • England, 1913
  • Hello! I'm Henry Moseley, and I joined Rutherford's research group in Manchester. I also wrote that the atomic number of an element is equal to the number of protons in the nucleus, thus beginning the reorganization of Mendeleev's periodic table.
  • Z = p+
  • *Legends: Z = Atomic Number P+= Protons
  • England, 1932
  • Hi! I'm James Chadwick, and I've worked with Rutherford in the Cavendish Laboratory in Cambridge. I proved that there are particles that have no charge at all, and I called them as neutrons.
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