South Pasadena · ap chemistry

Atomic Time Line

Project

To help you piece together the story of what we know about the "atom", you will be creating a timeline depicting the development of the scientific model of the atom. It has been through new discoveries by philosophers and scientists in chemistry, as well as physics, that the model of the atom has expanded and changed over time. Your assignment is to research the major contributors and significant discoveries that have impacted the atomic model and, from this material, develop a timeline. You are responsible for the information that you learn from your timeline.
Requirements:

Your timeline MUST:

1. 
   Match each of the 12 scientists and/or philosophers located in the tables below
   
   1. 
      to key dates (LOOK UP and put in chronological order)
      
   2. 
      and also their contributions to the atomic model.
      

2. Include each of the following pictorial models of the atom, clearly labeling key characteristics of these models (protons, neutrons, electrons, nucleus, etc…) to the Scientist who are identified by an astric in the first table:

• indivisible, solid sphere model

• quantum mechanical model

• planetary model

• plum (raisin) pudding model

• nuclear model

3. Be chronological in its sequence, with the dates clearly shown (it need not be to scale), and at a minimum include the information contained in the following table, but I would highly recommend adding additional data.

4. Utilize through pictures and/or diagrams the significant contributions and experiments of those scientists and atomic models examined in this project. For example, where an experiment or model is listed as a contribution, one of the above items would be appropriate. A minimum of 3 pictures and/or diagrams are required for the timeline. One of these pictures must include a hand drawn portrait of one of the chemists. The other two should be a diagram explaining the experiment used by the scientist.If these items are taken directly from a source(s), the source(s) must be cited using APA or MLA format. You may want to use easybib.com or another website to keep track of sources.

5. Be neat and legible.

6. All Atomic Line Projects must be completed on Poster paper which I will provide.
Deadlines and Guidelines:

• Your timeline is due on ___________________________

• You will be working with a partner and each person is responsible for the material covered in the time line!

• You do not have to follow the typical horizontal timeline format; you may be creative and use any format you wish. We will spend some class time in the library and the computer lab to assist in your research. One good option is a wagon wheel poster!

Required Information: (needs to be matched with key contributions in next table and included timeline) Key Scientists/Philosophers	Key Dates (LOOK UP!!)
Aristotle
*Niels Bohr
James Chadwick
*John Dalton
Louis deBroglie
Democritus of Adbera
Werner Heisenberg
Robert Millikan
Max Planck
*Ernest Rutherford
Erwin Schrödinger
*Joseph John Thomson

Contributions (Match to each of the above contributors)
planetary model of atom electrons travel in specified energy levels spectrum lines produced when electrons move	atoms can emit “quanta” Einstein used this scientist’s work to study photons
atomos- indivisible first to identify possibility of an atom smallest piece of matter	father of modern atomic theory 5 parts to theory Elements are composed of the same atoms Element’s atoms are identical in mass Elements combine to form compounds All compounds contain same atom ratio
measured charge of an electron oil drop experiment completed with Thomson	discovered electron described nature of cathode rays plum pudding model of atom
“uncertainty principle” impossible to determine the position and the momentum of a particle at the same time “cloud” model aka quantum mechanical model	four “elements”: earth, fire, air, water believed in reasoning instead of scientific experiments dismissed Democritus’ atom idea as “worthless”
electrons have properties of both waves and particles group of waves named after this scientist	gold foil experiment atom has small positive charged nucleus, remainder is empty space predicted existence of neutrons
showed mathematically that waves can be used to describe electrons in atoms determined probability location of electrons in atoms	helped with the development of the nuclear model discovered neutron

Helpful Websites:

• http://profmokeur.ca/chemistry/history_of_the_atom.htm

http://www.nobeliefs.com/atom.htm

http://www.timetoast.com/timelines/history-of-the-atomic-model--36

education.jlab.org/jsat/powerpoint/atomos.ppt‎

http://en.wikipedia.org/wiki/Atomic_theory

http://www.easybib.com


Grading Rubric for

Atomic Time Line Poster Project

Category	Expectation	Points
Name	1.____________________ 2._____________________	­_____/10
Creativity	Originality: How much of the project is you?	_____/10
	Creativity: How creative did you get with what you had? (Color/shading/pictures/lay-out)	_____/10
	Project Design: Did you stay within the required format?	_____/5
Context	Scientist: Did you include all scientists and include discoveries and experiments?	_____/30
	Atomic Models: Should have labeled pictures of models including the dates.	_____/20
References	Work Cited Page: Did you cite all references and site MLA or APA format?	_____/5
Group Evaluation	Peer Review: How much input did you have in your project	_____/10
Extra Credit	Scientist: Scientist or philosophers who aided in the discovery of the atom may be added to your timeline. All required information for the original group of atomic scientist should be included. (MAX 5 scientist) Example of a few Wolfgang Pauli, Leucippus of Miletus, Henri Becquerel, Francis Aston, and Amedeo Avogadro.	_____/2 bonus points per scientist / philosopher. 10 point MAX

This Rubric should be glued to the back of your poster!!

AP Chemistry R L Patton High