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These flow charts illustrate where energy comes from and what it is used for. An example is shown below.

This chart from Washington University in St. Louis is a great resource for additional help with molecular geometries, which is critical in assigning the correct point groups to molecules.

This flowchart from the Otterbein symmetry website includes every point group, including some very rare, very high symmetry examples such as I, O, and T_h.

https://symotter.org/assets/flowchart.pdf

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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An overview website containing a variety of interactive symmetry tools.

http://www.reciprocalnet.org/edumodules/symmetry/index.html