University of Sydney has created a practice website for reviewing different parts of molecular orbital diagrams. Using this resource you can add pieces to pre-drawn MO diagrams for over 20 different molecules.

The site includes opportunities to practice filling in electrons, attaching the names/symbols of MOs, and matching orbital overlap drawings to MOs.

Give them a try here:

https://scilearn.sydney.edu.au/fychemistry/calculators/mo_diagrams.shtml

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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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Chemistry blog Compound Interest maps out a beautiful image on a variety of common gemstones and the inorganic components which contribute to their observed color.

http://www.compoundchem.com/2014/06/29/what-causes-the-colour-of-gemstones/

View the picture and more in the link above or copy and paste the URL.

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A large collection of rotatable, interactive structures. From small molecules to metallic or ionic solids, this collection may have the molecule you are trying to see in 3D.

http://www.chemtube3d.com

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Interactive and detailed look at atomic orbitals.

http://winter.group.shef.ac.uk/orbitron/

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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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This site offers applications for visualizing atomic orbitals in all their beauty.

http://daugerresearch.com/orbitals/index.shtml

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