Chemistry~AS

Chemistry~AS

1. Development of the Atom

   • Ionization Energies
     • Energy that gaseous atom must absorb to discharge an electron
     • show what group element is in
     • Larger amount of energy needed if full energy level
       • Force of attraction is larger
         • Atom has + charge
         • Electron - charge
     • Periodic table
       • decreases on going down a group
       • increases on going across a period
     • higher the energy of the photon absorbed, the higher the energy level the electron jumps
   • Individuals
     • Henry Moseley
       • Reorder the periodic table by atomic number
         • Prediction of lanthanide elements
       • Work on x-ray spectrometry
     • Joseph J Tomson
       • Proved cathode rays consist of particles and electrons
       • determined the mass of the particles
         • By deflecting cathode rays using magnetic and electric fields
       • Plum pudding model
     • Hans Geiger, Ernest Marsden And Ernest Rutherford
       • Proved the plum pudding moodel wrong
         • Planatery model of atom
       • Gold foil experiment

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