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atomic theory atomic theory Presentation Transcript

  • Atomic Theory
    By: Katelin Troy
  • Some History:
    Henry Baquel
    Found that Uranium ore emitted rays.
  • Marie and Pierre Curie
    Worked with radioactivity and discovered three subatomic particles:
    ~ Alpha ()
    ~ Beta ()
    ~ Gamma (γ)
    These explain electrical charges in an atom.
  • J.J. Thomson
    ~ Studied charges in a Cathode Ray Tube.
    ~ Discovered through his experiment that atoms have negatively charged particles.
  • Robert Millikan
    ~ Worked with charged oil drops in a chamber.
    ~Discovered the charge and mass of electrons and protons:
    Electron
    - Charge= -1
    - Mass= 9.1094 * 10-28 g
    Proton
    - Charge = +1
    - Mass = 1.6726 * 10^-24g
  • Earnest Rutherford
    Worked with gold foil experiment
    - Charged particles were aimed at Au atoms.
    Conclusions:
    - An atom has a small positive middle, aka the nucleus.
    - Most of the volume of the nucleus is taken up by electrons.
  • Atomic Structure
    ~ Proton (p+)
    ~ Electron (e-)
    ~ Neutron (n)
    electron
    electron
    electron
    nucleus
    ~protons
    ~neutrons
  • Nucleus:
    ~ p+ and n
    ~ most of atomic mass
    ~ small
    ~ positive charge
  • Outside Nucleus:
    ~ contains e-
    ~ small light particles
    ~ occupy most of volume
    ~ negative charge
  • Atoms are neutral
    ~ Number of e- = number of p+
    There are 3 electrons in this atom, how many protons are there?
  • On the Periodic Table of Elements:
    Atomic Number
    Symbol
    Name
    Atomic weight
    1
    H
    Hydrogen
    1.0079
  • Mass Number
    ~ Not on Periodic Table.
    ~ Number of particles in the nucleus.
    ~ Equal to number of protons and neutrons.
  • Nuclear Symbols:
    Mass #
    A
    X
    Atomic #
    Symbol
    Z
    Examples:
    Na
    Br
    22
    80
    11
    35
  • Isotopes:
    Atoms of the same element with different mass numbers.
    Example: Hydrogen Isotopes
    Hydrogen Deuterium Tritium
    3
    H
    H
    H
    1
    2
    1
    1
    1
  • The End
    The End
  • Works Cited:
    Moore, John, et al. Chemistry The Molecular Science. Belmont, CA: Brooks/Cole, 2011. Print.
  • Photos and Diagrams Cited:
    Slide 2: http://www.flickr.com/photos/52307935@N00/291472553/sizes/l/in/set-72157594358781695/
    Slide 7, 11, 13:
    Katelin Troy
    Slide 15: http://www.flickr.com/photos/d-kav/4428566547/sizes/o/in/photostream/