The history of the Atom

The history of the Atom

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  • Daltons Atomic Theory  1)All matter is made up of small particles called atoms  2)All atoms are indivisable
  • 1)Straight lines  2) Deflected by electric/magnetic fields 3)move paddle wheele
  • William Crookes!  ~Discovered the electron  ~Demonstrated that rays come from the cathode (Cathode rays)
  • Concluded that cathode rays consist of negativly charged particles called electrons
  • Proposed the structure of the atom  -Sphere of poss charge  -Electrons embedded at random
  • JJ Thomson 
  • electron is a neg. charged particle with very small mass
  • Robert Milikan 
  • A few deflected at large angles due to the possative nucleus  Some reflected back due to head on collisions  Most went straight through because most of the atom is empty.
  • Electron Cloud!
  • Rutherford 
  • Discovered the neutron. It has the same mass as the proton but were neutral. 
  • Chadwick 
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