Lesson 1


LESSON 1.  Historical Perspective





Objective:  Students learn the evolution of atomic theory.


Teacher Notes:


In Physical Science - Math Skills, Chapter IV (Symmetry of Matter), we discussed the early concepts of the forms of matter.  In Physical Science - Matter, Chapter I (Periodic Table) we looked at how we understand the atom in 2008.


This lesson looks more at the atomic theory and how it evolved historically.  Some of the people that contributed to the Periodic Table, also started to think about the structure of the atom. The Greek Leucippus and Democritus in the 400s BC thought about tiny particles, but the technology to understand the atom would not be present until over 2000 years later when machines like linear accelerators where invented to look at how subatomic particles react.  As new equipment is used the concept can be refined or even changed.


Students should read the material and then complete the worksheet, which reviews the material.   



1.  A.  Fourth; B.  First; C. Third; D. Second
2.  A;   3.  C  4.  B

5.  B  6.  D;  7. E

8.  B; 9. A; 10 D

11.  Since scientists could not see or experiment on atoms, they had to deduce what
        made it work or use mathematically models; it is hard to discover something you
        have not idea is there

12.  Yes, new data from accelerators could find new components, especially if they 
       build more powerful collisions

13.  Leptons (tau, muon, electron, tau neutrino, muon neutrino, electron neutrino)

       Quarks  (bottom, strange, down, top, charm, up)
14.  Particle accelerators
15.  The Standard Model


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