CK-12 Foundation
Ck 12: Ions
[Free Registration/Login may be required to access all resource tools.] In the following online tutorial students will be able to determine the number of valence electrons for any element and draw an electron dot diagram for any atom....
Michael Blaber, PhD
Fsu: Basic Concepts of Chemical Bonding: Exceptions to the Octet Rule
Lists the exceptions to the octet rule and provides a discussion and diagrams explaining each one. Includes clear diagrams illustrating this concept.
Sophia Learning
Sophia: Interpreting Electron Configurations: Lesson 3
This lesson will demonstrate how to identify an element and state the number of valence electrons given its electron configuration. It is 3 of 3 in the series titled "Interpreting Electron Configurations."
Massachusetts Institute of Technology
Mit: Inventor of the Week: Gilbert Lewis
At this site from the Massachusetts Institute of Technology, you can read about the inventor of "Heavy Water," Gilbert Newton Lewis, who is "one of the most influential and admired scientists of the twentieth century."
Michael Blaber, PhD
Florida State University: Electronic Structure of Atoms: Electron Configurations
Florida State University provides this article on electronic configurations of atoms and Hund's rule.
Frostburg State University
General Chemistry Online: The Periodic Table
This is a teacher's companion guide with lesson plans for the periodic table. It includes learning objectives, lecture notes, links to related sites, answers to frequently asked questions, and a glossary of related terms.