The Atomic Theory Timeline Project
www.harrischemistry.com
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 debates by ancient philosophers and new discoveries by physicists and chemists over the past 2500 years that our understanding of the atom has developed. Your assignment is to research the major contributors and significant discoveries that have impacted the atomic model and develop a timeline.
DUE DATE: __________________________________
Your timeline must:
1. Include AT LEAST 3 scientists from each of the following time periods. There are more than 3 scientists in each time period. For each scientist included provide their name, dates of birth and death, country of origin, year of discovery and contribution.
a. Ancient Greek/Roman/Asian/African philosophers b. 466-1700 c. 1700-1800 d. 1800-1875 e. 1875-1900 f. 1900-1915 g. 1915-2012
2. Include the following pictorial models of the atom along with an explanation of the model including the date developed:
a. Small, spherical, solid, indivisible model b. Electron cloud model c. Plum pudding model d. Rutherford-Bohr model e. Planetary model
3. Contain 3 major world events in each time period: a. Ancient b. 500-1800 c. 1800-1875 d. 1875-1900 e. 1900-1915 f. 1915-1950 g. 1950-2012
4. Be chronological in its sequence, with the dates clearly shown although it need not be to scale. Place the world events on top of the timeline, and the scientists on the bottom of the timeline. Make sure that the data you select is appropriate and significant for each time period.
5. Be neat and legible.
The Atomic Theory Timeline Project
www.harrischemistry.com
List of scientists with contributions to the modern atomic theory:
**Democritus
Aristotle
Antoine Lavoisier
Charles-Augustin deCoulomb
Sir Isaac Newton
**John Dalton
Michael Faraday
Julius Plucker
Dmitri Mendeleev
James Clerk Maxwell
George Johnstone Stoney
Sir William Crookes
Eugen Goldstein
**Wilhelm Röentgen
**Henri Becquerel
**Joseph John Thomson
**Ernest Rutherford
**Marie Curie
Max Planck
Albert Einstein
**Robert Millikan
Frederick Soddy
Hantaro Nagaoka
Richard Abegg
Hans Geiger
**Erwin Schröedinger
Henry Moseley
Francis William Aston
**Niels Bohr
**Werner Heisenberg
Louis de Broglie
John Cockcroft, Ernest Walton
Paul Dirac
**James Chadwick
Lise Meitner, Otto Hahn, Fritz Strassman
Glenn Seaborg
Enrico Fermi
Murray Gell-Mann, George Zweig
**These scientists must be included.