Genchem

• John Dalton


  Solid Sphere Model
• J.J. Thomson


  Cathode Ray Experiment
• Ernest Rutherford


  Gold-Foil Experiment discovered Alpha & Beta rays
• Rutherford's model

  Discrepancy noticed by Niels Bohr
• If electrons are orbiting around the nucleus, energy will be lost, making atoms unstable
• Werner Heisenberg


  Heisenberg Uncertainty Principle
• Erwin Schrödinger


  The Quantum Mechanical Model
• Solid Sphere Model


  • Atoms of different elements combine in simple whole-number ratios to form chemical compounds
  • In a chemical reaction atoms are rearranged, to form a new compound
• Cathode Ray Experiment


  • Visible beam of particles released in a vacuum glass tube
  • All atoms contain tiny negatively charged particles
• Nuclear Model of Atom


  • Infer that at its core, the mass of an atom was concentrated
• Planetary Model of Atom


  • Electrons moved around the nucleus in fixed orbits or shells
• Heisenberg Uncertainty Principle


  The position and momentum of the particle cannot be measured simultaneously
• The Quantum Mechanical Model


  • Formulated the Wave Equation that accurately calculated the energy levels of electrons in atoms