History of Atomic Discoveries
Purpose: To create a large timeline showing the history of atomic discoveries. Use the
questions below and your book in order to create the timeline. Please be specific and
descriptive in providing information. The project can take MANY different forms. For
example
o
A blog/face book page
o
Flip book
o
Animoto, Prezi, Glogster, Macromedia Flash, Inspiration or other web based
program.
o
Be creative, but the scientists MUST be in chronological order.
Sources:
 Sources must be sighted, copy and pasting information directly from a web page is
plagiarism and students will receive a zero for the assignment.
4.1 Defining the Atom
Early Models of the Atom
1. Who was Democritus (life span/nationality/occupation) and what did he believe (see
figure 4.1)? Include Date
2. Who was John Dalton (life span/nationality/occupation)? List the components of
his atomic theory. Include Date
4.2 Structure of the Nuclear Atom
Subatomic Particles
3. Who was JJ Thomson (life span/nationality/occupation)? In what year did he
discover the electron? Briefly describe his hypothesis, experiment and what he
found out regarding the electron. Also, describe his plum pudding model (page 106
last paragraph) Include Date
4. Who was Robert Millikan (life span/nationality/occupation)? What did he discover
through his experiments regarding the electron (be specific)? Include Date
The Atomic Nucleus
5. Discuss the discovery of the proton (p106 who, what did he conclude about the
proton (charge, mass)?). Include Date
6. Discuss the discovery of the neutron (p106 who, what did he conclude about the
neutron (charge, mass)?). Include Date
7. Who was Ernest Rutherford (life span/nationality/occupation)? Describe his gold
foil experiment (use pictures and words, be specific). What did he conclude about
the atom and the nucleus (p 107)? Include Date
25.1 Nuclear Radiation
Radioactivity
8.
Who were Marie and Pierre Curie? When did they live? What was their
contribution to radioactivity? Include Date
9.
Who was Henri Bequerel? When did he live? What was his contribution to
radioactivity? Include Date
5.1
Models of the atom
The Bohr Model
10.
Who was Bohr? When did he live? Illustrate and describe his model.
Include Date
The Quantum Mechanical Model
11.
Who was Shrodinger? When did he live? What was his contribution to the
modern model? Include Date
12.
Who was Hantaro Nagaoka? What did he do and when? (p.128) Include Date
13.
Who was de Broglie? What did he do and when? (p.129) Include Date