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It's Elemental: Oxygen
Basic physical and historical information.
WebElements: Oxygen
Extensive information on history, uses, occurrence, compounds, and properties of the element.
ChemicalElements.com: Oxygen
Basic information, atomic structure, and table of isotopes.
Wikipedia: Oxygen
Properties of the element, including its history, applications, and charateristics.
Visual Elements: Oxygen
Animation, uses, physical information, and key isotopes.
Oxygen
Data tables and historic information.
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