Science assignment (atomic structure)


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  • 1868
  • Let us make a table classifying all the elements by their atomic mass
  • Demitri Mendeleev
  • 1898 - 1903
  • Negative electrons exist in an atom. They are embedded in a flow of positive charges
  • J. J. Thompson
  • 1911
  • Ernest Rutherford
  • In an atom the positive charges are created in the nucleus.
  • 1913
  • Electrons move in orbits with quantized energy levels.
  • Neils Bohr
  • 1913
  • Henry Moseley
  • In every atom there is an atomic number which is equal to the amount of protons
  • 1932
  • James Chadwick
  • A side from positive and negative charged particles there are also neutrons, particles with no charge which are also located in the nucleus
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