This "online textbook" is designed to provide a thorough, in-depth treatment of this topic at the first-year college or advanced-HS levels, with a special focus on the underlying concepts.
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Click one of the six lesson titles immediately below on the left;
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1- Quanta: a new view of the world
2- Light, particles and waves
3- The Bohr atom
4- The quantum atom
5- Atomic electron configurations
6- Periodic properties of the elements
Among the many sources the author drew upon, special mention should be made of Pimentel and Spratley’s Understanding Chemistry, S. Brush’s Introduction to Concepts and Theories in Physical Science, P. Atkin’s Quanta, P. Davies’ The Forces of Nature, and the inspired writing of Toulmin and Goodfield in The Architecture of Matter.