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Introductory Organic Chemistry - Lecture 3

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Lecture 3 - Double Minima, Earnshaw's Theorem and Plum-Puddings

Continuing the discussion of Lewis structures and chemical forces from the previous lecture, Professor McBride introduces the double-well potential of the ozone molecule and its structural equilibrium. The inability for inverse-square force laws to account for stable arrangements of charged particles is prescribed by Earnshaw's Theorem, which may be visualized by means of lines of force. J.J. Thomson circumvented Earnshaw's prohibition on structure by postulating a "plum-pudding" atom. When Rutherford showed that the nucleus was a point, Thomson had to conclude that Coulomb's law was invalid at small distances.

Prof. J. Michael McBride
CHEM 125: Freshman Organic Chemistry, Fall 2008
(Yale University: Open Yale)
Date accessed: 2009-11-11
License: Creative Commons BY-NC-SA

Lecture Material

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Supplementary lecture material is listed below.

1. What's Wrong with Lewis Structures
2. What are Force Laws?
3. Earnshaw via Lines of Force
4. Shell Structure for Charged Balls in 2D
5. Dealing with Graphs - Lesson 1
6. Drill on multidimensional plotting
7. Problem Set



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