Science Comic Strip Page 2

Science Comic Strip Page 2

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  • Electrons have a negative charge
  • 1904: Joseph John Tomson suggested the plum pudding model of the atom 
  • 1897: Joseph John Thomson discovered electrons
  • Electrons have a charge equal to -1.6022×10^19
  • 1908-1917: Robert Millikan found that the charge of an electron is equal to -1.6022×10^19
  • 1910-1911: Erenest Rutherford observed that atoms are moslty empty space
  • Electrons move in concentric orbits around the nucleus
  • 1913: Niels Bohr proposed an atomic theory that electrons move in concentric orbits around the nucleus
  • 1913: Henry Gwyn Jeffreys Moseley used X-Ray spectra to study atomic structure
  • Protons have a positive charge
  • 1919: Ernest Rutherford discovered protons
  • Neutrons have no charge
  • 1932: James Chadwick discovered neutrons
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