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history of atom overhead

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					SCIENTIST           METHOD                       CONTRIBUTION
 Democritus
  and the         Questioning,                Hypothesized concept of
Greeks 2000    observing, inferring       atom…ATOMOS = “indivisible”
   Y.A.

                                       Came up w/ ATOMIC THEORY:
                                       1) All elements are made of atoms.
                 Experiments with
                                       2) Atoms of same element are exactly
                      gases –
John Dalton                            alike.
                 Found that gases
   1803                                3) Atoms of different elements are
                   were made of
                                       different.
                individual particles
                                       4) Molecules are the result of the
                                       chemical combo of atoms.

                                     Discovered atom was divisible
                  Sent electricity
                                     Contains the ELECTRON
               through an uncharged
J.J. Thomson
                      gas…           Plum Pudding model
     1897                                                    + - +
                 – particles came                            - + -
                       out!                                  + - +

                “Shot” + particles
   Ernest       through a piece of      Discovered center of atom = nucleus
 Rutherford      gold foil…some         Nucleus has + charge
   1908         passed through…         e- are floating in mostly empty space
               some bounced back

                Hypothesized and        Created the Bohr Model
 Niels Bohr
                built upon work of      Electrons “orbit” nucleus in definite
   1913
                    Rutherford           circles called energy levels.

                                        Impossible to determine the exact
 The Wave
                 Worked with             location of an electron
   Model
               MATHEMATICAL             Energy of electron at a given time
 Scientists
                  equations              determines its location
  TODAY
                                        Opposite of Bohr Model

				
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posted:12/31/2011
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