2 Feb 2012

CBC (Covalent Bond Classification) Method of Electron Counting

Five Slides About

Submitted by Chip Nataro, Lafayette College

This series of slides works through an example of electron counting using the CBC (Covalent Bond Classification) method. It compares and contrasts the classic ionic and covalent methods to the CBC method. The example used in these slides is an exception to the 18 electron rule using the the classic methods, but by CBC classification it is a very common ML4X4 tetravalent 16 electron Ti compound.

File 5slidesonCBC.pptx140.34 KB
Learning Goals: 

This series of slides presents a very introductory look at the CBC method. Upon completion a student should have a general idea of counting electrons based on the types of ligands (L or Z), calculating the metal valence, classifying the metal and determining the ligand bond number (LBN).

Implementation Notes: 

This is only a brief introduction. I have a full series of slides on this topic if anyone is interested just contact me.

Evaluation Methods: 

I have been teaching the CBC method in my Inorganic 2 class for two years now. Students seem to have picked up on it very well. As it is the first topic I cover in the course, it is constantly evaluated in all of the rest of the material.

Evaluation Results: 

My class this year has multiple students heading off to graduate school with an interest in doing organometallics. I think this will be the ultimate judgement of how well this material is presented.

Creative Commons License: 
Creative Commons Licence


Apparently something was a little messed on the valence plot for Ti on slide 11. I am not sure why, but it was showing Ti(III) as the most common valence. I believe I have fixed it now and it correctly shows Ti(IV) as the most common. Thanks to Betsy Jamieson for pointing this out.

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