Science Struck
Science Struck: Electron Cloud Theory Explained
Explains the Uncertainty Principle, wave-particle duality, what the electron cloud model is, and how it came about as a result of the Schrodinger equation for Hydrogen.
American Chemical Society
Middle School Chemistry: Periodic Table and Energy Level Models
Learners interpret the information given in the periodic table to describe the arrangement of electrons on the energy levels around an atom.
University of Waterloo (Canada)
University of Waterloo: Vsepr Models
The University of Waterloo provides background in pair repulsion and confidence building questions. Try this one once you think you know what you are doing!