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ChemicalElements.com: Oxygen
Features basic information, an atomic structure diagram, facts about oxygen and a table of isotopes.
LANL: Oxygen
Details of the history, sources, forms, compounds, and isotopes of oxygen.
Visual Elements: Oxygen
Explains the uses and physical properties of oxygen. Includes a visual representation and downloadable animation.
WebElements: Oxygen
History, uses, occurrence, compounds, and properties. Features a picture of liquid oxygen and a sound file.
Wikipedia: Oxygen
Article covering properties of the element, including its history, applications, and characteristics as well as safety precautions.