particles c1

  • Created by: faiqa1331
  • Created on: 11-10-18 06:37
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  • particles c1
    • devoloping the atomic model
      • 1803
        • daltons solid atom
        • electron discovered
      • 1897
        • thomson's plum-pudding model
      • 1909
        • ruhterford's planetary model
        • mathematical model
      • 1913
        • bohrs energy level model
        • proton then neutron discovered
    • the subatomic particles
      • proton = 1 = +1
      • neutron = 1 = 0
      • electron = 0.0005 = -1
    • the particle model
      • particles are represented as hard spheres
      • properties of a substance depend on its state
      • solid
        • very close together
        • reguler arrangement
        • vibrate around fixed position
      • liquid
        • close together
        • randm arrangement
        • move around each other
      • gas
        • far apart
        • random arrangement
        • move quickly in all directions
    • limitations of the particle model
      • model does not take into account
        • forces between particles
        • size of particles
        • space between particles
    • atomic structure
      • isotopes
        • atoms of an element with the different number of neutrons
      • ions
        • atoms that have gained or lost electron
    • chemical and physical changes
      • physical
        • reversible
        • no new substance are made
      • chemical
        • often difficult to reverse
        • new substances made

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