Adventures in Atomic Theory

A Subject Sampler
created by Linda Kelly ~ John Marshall High School ~ Science Department

Read through the web sites and answer the following:

Go to http://en.wikipedia.org/wiki/Democritus

1) What did Democritus believe about matter?

2) What word do we get from his description?

3) When did he do this?

Go to http://northspringer.tripod.com/HistoryofAtom/id1.html

1) When did John Dalton originate the idea of an atomic theory?

2) In his book, Chemical Philosophy, how did he propose to identify elements?

3) What were John Dalton’s basic ideas about matter?

Go to http://antoine.frostburg.edu/chem/senese/101/atoms/dalton-quiz.shtml

Based on your understanding of Dalton’s ideas, answer the questions on the quiz.

How many questions did you answer correctly?______

Go to http://www.chemsoc.org/timeline/pages/1803.html

Sketch a drawing of Dalton's idea of an atom.

Go to http://www.aip.org/history/electron/jjhome.htm

1) What British physicist was studying the inside of the atom?

2) How long ago did he do this?

3) Through his experiments with electricity and cathode rays, what did he discover about these rays?

4) How did this discovery disprove Dalton’s idea of the atom?

5) What are cathode rays made up of?

Go to http://www68.pair.com/willisb/millikan/experiment.html

1) Who performed the oil drop experiment?
2) When?
3 ) What did he discover?

Read about the experiment and play the simulations.

4) How did this experiment further disprove Dalton's ideas?

Go to http://www2.kutl.kyushu-u.ac.jp/seminar/MicroWorld1_E/Part2_E/P24_E/Thomson_model_E.htm

Sketch a picture of the atom at this time:

Go to http://www.bcpl.net/~kdrews/introterms/intro7.html

1) How did Ernest Rutherford perform his experiment?

2) When the alpha particle bounced off the gold nucleus, what conclusion can be made about the atom?

3) How does this discovery disprove Dalton's idea about the atom?

Sketch a picture of Rutherford’s Planetary Model of the atom:

Go to http://csep10.phys.utk.edu/astr162/lect/light/bohr.html

1) When did Niels Bohr propose his theory about the atom?

Sketch a drawing of the Bohr atomic model of the atom:

The correct theory of the atom is called q_____________ m___________ (which you will study in ch. 4).

Go to http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/page.htm

Answer this quiz. How many questions did you answer correctly? ______

Works Cited ~ graphics - Wikipedia, Encyclopaedia Britannica, InfoTrac, http://cwx.prenhall.com/bookbind/pubbooks/

blb/chapter2/medialib/blb0202.html- Biography Resource Center; title-www.flamingtext.com