This video walks through how to calculate packing efficiency of unit cells.

Just a fun video to help remember the periodic table!

Watch this video for a refresher on VSEPR Theory

For help in understanding orbital changes upon mixing view this video from Oxford University Press:

Note: The video uses nomenclature u and g labels for the orbitals. For the CHEM 251 course you can ignore those symbols.

https://www.youtube.com/watch?v=qoYEOMMJCXc

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A quick video reviewing Fajans’ Rules for determining covalent versus ionic bonding.

A couple of examples given and also an example relating to the melting point of substances.

https://www.youtube.com/watch?v=u-bF5cQqhnI

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A video guide to Slater’s rules, including some worked examples.

https://www.youtube.com/watch?v=7wrTWlXI2IY

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