Developing the Atom Model

• John Dalton believed Democritus;that matter was made out of tiny dense spheres which are indivisible but each element was made out of a type of atom.

  
• 2. JJ Thompson created the Plum Pudding Model. Where atoms were positively charges spheres, with electrons scattered in them.

  
• 3. Rutherford carried out the alpha particle experiment. Firing alpha particles at a thin sheet of Gold. Some particles deflected, some went through. Proving the atom was concentrated at the centre - nucleus.

  
• 4. The Nuclear model showed that positive nucleus was surrounded by a cloud of negative electrons.

  
• 5. Neils Bohr proved that electrons orbited the nucleus at different distances called energy levels.

  
• 6. James Chadwick proved the existance of neutrons.