history of atom models

history of atom models
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  • john dalton 1808
  • electric charge was unknown by this time.
  • j.j thomson 1897
  • propsed a postive particle and that the negstive particles were in the postive.
  • ernest rutherford 1911
  • he called positive particles protons and the center of atoms the nucleus. he also showed that positive particles are in the nucleus which is mostly empty space.
  • neils bohr 1913
  • he proposed that electrons move around in specific layers or shells.
  • james chadwick 1932
  • while working with rutherford he discovered particles with no charge.
  • modern day model
  • it has electrons moving around in the nucleus cloud. its impossible to know where electons are at any given time.
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