Download Timeline Assignment

Names: _______________________________________________ Block: _____
History Timeline Assignment
1. Refer to Hebden p. 139-144 and create “The Early Development of the Atomic Theory Timeline”
using your notes.
2. You may use additional resources online e.g. to print pictures and include them in your timeline.
3. Your Timeline should include the following:
 Timeline with a range: 500 B.C. – 2000 A.D. (drawn to scale)
 Name of the following scientists & their theory/discovery
 Relevant diagrams and pictures of the scientists & their models/theory
 Write all information in POINT FORM. Be concise.
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Democritus
Aristotle
Dalton
J. J. Thomson
Henri Bequerel
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Marie & Pierre
Curie
Ernest
Rutherford
Niels Bohr
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Robert Milliken
J. Chadwick
Early Greek’s 4
Element Ideal
Atomic History Notes
Greek Model
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Early Greek philosophers believed all matter was made up of four “elements”
 earth, air, water, and fire
John Dalton (1766 – 1844)
Theory  Determined the Atomic Theory:
1.
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3.
4.
All matter is made up of atoms too small to see.
Each element has its own kind of atom.
Compounds are created when atoms of different elements link to form compound atoms.
Atoms cannot be created or destroyed.
Strength  Able to explain why elements differ from non–elements and from each other.
Weakness  Point #4 is incorrect. Atoms can be split into subatomic particles (protons, neutrons,
electrons).
ETC.
Example:
The Development of Cellphone Timeline