Atomic structure

  • Created by: jaaaz_v
  • Created on: 18-05-15 21:09
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  • Atomic Structure
    • The basic structure of an atom is a small nucleus made up of protons and neutrons, surrounded by electrons
      • Protons and neutrons have a mass of 1, while electrons have a mass of 1/2000
      • Protons have a + charge, neutrons have no charge, and electrons have a - charge
      • Number of electrons = the number of protons in the nucleus
      • Atoms have no overall electrical charge
    • Rutherford and Marsden
      • Tried firing a beam of alpha particles at thin gold foil
      • Expected positively charges alpha particles to be deflected by the electrons in the plumb pudding model
      • Most alpha particles went straight through
        • Meant that the mass of an atom was concentrated in the nucleus
        • Nucleus must have a positive charge since it repelled the positive alpha particles
    • Plumb pudding
      • Thomson suggested that atoms were spheres of positive charge
      • Tiny negative electrons stuck to the positive charged spheres
      • Like plums in a pudding


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