Wednesday, June 13, 2007

Lecture Level I Molecular Orbital Theory Physical Chemistry

Molecular orbital theory is also a difficult topic. I found material from the site below to be useful to understand this topic.

Molecular Orbital Theory

Diamagnetic and Paramagnetic substances

Atoms or molecules in which the electrons are paired are diamagnetic repelled by both poles of a magnetic. Those that have one or more unpaired electrons are paramagnetic attracted to a magnetic field. Liquid oxygen is attracted to a magnetic field and can actually bridge the gap between the poles of a horseshoe magnet. The molecular orbital model of O2 is therefore superior to the valence-bond model, which cannot explain this property of oxygen.

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