Scientists

• John Dalton


  Suggested atoms are particles that are unable to be divided, and make up elements.

  Atoms in each element are identical
• J.J. Thompson


  -Cathode ray experiment plead to the plum pudding model
• Ernest rutherford


  Conducted gold foil experiment which discovered the nucleus in which contained positively and negatively charged particles
• Niels Bohr 


  Refined Rutherfords model by introducing the idea of electronic shells

  Proposed the idea that electrons orbit the nucleus as specific distances
• James Chadwick


  Discovered the neutron

  Explained the additional mass no accounted for by protons