 We will be creating a timeline as a class.  Each group will be given a specific year or event. Using a computer, your task, as a group:  Determine.

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Presentation transcript:

 We will be creating a timeline as a class.  Each group will be given a specific year or event. Using a computer, your task, as a group:  Determine what significant event in/related to nuclear physics occurred in that year (or which year the event occurred)  Determine which scientist(s) were involved  Be prepared to present a BRIEF summary of the event (you are not expected to understand/have details…those will come later!)  You will have 15 minutes max to complete this task!  Following your brief presentation, you will fill in the class timeline with your information

 Two distinct models of the structure of an atom:  : JJ Thomson  : Ernest Rutherford  Use the resources provided to create a detailed, labeled set of illustrations to compare these two models of atomic structure  1 Poster per group  Diagrams, labels, and caption describing the model are all required. Due in 20 minutes.

 An atom is a mixture of positive and negative charges Image from:

Gold-Foil Experiment:  Very thin gold foil  Focused a beam of Helium nuclei  Observed the result of colliding the He nuclei with the Gold foil

 Expected Results:  Positive Helium Nucleus would pass straight through the gold foil or only be slightly deflected…  Actual Results:  Most particles DID pass straight through with little to no deflection…  However: Several had unexpectedly large deflection angles!

Ernest Rutherford—several years after the Gold Foil Experiment

 Atoms have a dense, positively charged center (later called the nucleus) and the electrons must be in the space surrounding the nucleus  Completely different model than Thomson’s “Plum Pudding” model

Image from:

 Massive, positively charged nucleus  Electrons orbited much like planets around the Sun  The Coulombic (electrostatic) force of attraction between the positive protons and the negative electrons kept the electrons in orbit