A video demonstration of the atom from Salman Khan of Khan Academy.
Khan Academy
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An interactive tool designed to help you develop an understanding of how Lewis Dot Structures are created.
St. Olaf College - General Chemsitry Toolkit
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A brief history and time-line for the study of the Atom
The Particle Adventure
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It's just a brief discussion of how AA works.
Atomic-Absorption Spectroscopy
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Comprehensive and detailed explanations of how quantum numbers work, complete with pictures of orbitals, and diagrams illustrating the order of filling subshells.
The Chemogenesis Web Book
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Chapter 6 - Standard Esthetics
StudyStack
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Explains most of the periodic trends in terms of shielding of the nucleus by the inner shells of electrons. Includes a discussion of size (radius), ionization energy, electron affinity, electronegativity, metallic character, reactivity and common charges.
Indian Institute of Technology
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Describes the molecular geometry of various chemical compounds, giving the general description of each and names of the shapes.
Molecular Geometry Overview
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A review of this basic principle of atomic structure.
Indiana University - Chemistry 101
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