Atomic structure

• J.J Thompson 


  Plum pudding
• John Dalton 


  Atoms as tiny spheres, that couldnt be broken down
• Ernest Rutherford


  Discovered protons and that mass concentrated in centre called nucleus

  Mostly empty space and electrons randomly around nucleus
• Neils Bohr 


  Planetary model- electrons oribit nucleus at fixed distances/orbits called shells
• James Chadwick 


  Provided evidence for existence of nuetrons
• What was unusual about the neutron?

  Most scientists acknowledged the nuetron but couldnt prove its existence
• Sub-atomic particles 


  Proton

  Neutron

  Electron
• What order where the parts of an atom found in?

  Electron

  Nucleus

  Proton

  Neutron