Valence Bond Theory

• as the name valence bond theory implies, it is the theory of bonding on a valence (electron) level
• a bond: the overlap of an orbital with a single electron with another orbital with a single electron


• the resulting bond orbital contains 2 electrons of opposite spin

From today: p232 (1 to 5; with #4 provide both energy level & orbital sktech for each molecule) and complete the hybridization preparation handout

At this point you should be able to represent bonding in terms of (1) Lewis structure (2) 3-D shape (3) energy level diagram and (4) orbital sketch

There are a few issues with VBT as it has been described so far...

Considered the conflict between bond angles as indicated by the VBT depiction of H2O compared to the VSEPR bond angles. The link below will address the bond angle conflict as well as look ahead at hybridization.

http://www.sparknotes.com/testprep/books/sat2/chemistry/chapter4section9.rhtml

The above link is an SAT test preparation site. Have a look around the site for other interesting gems.

I am running out of time for today. I shall leave you with another polar [bear] joke: Why do polar bears win so many races? Answer: Because they are always in the "pole" position. Another question : Where will Woody be tomorrow?