Chemistry 125A: Freshman Organic Chemistry I - Lecture 3: Double Minima, Earnshaw's Theorem and Plum-Puddings - Professor J. Michael McBride
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
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