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- Wikipedia: Oxygen Properties of the element, including its history, applications, and characteristics.
- ChemicalElements.com: Oxygen Basic information, atomic structure, and table of isotopes.
- WebElements: Oxygen Information on history, uses, occurrence, compounds, and properties of the element.
- It's Elemental: Oxygen Basic physical and historical information.
- Especiál Gas Inc.: Oxygen Numeric data, uses, and general information.
- EnvironmentalChemistry.com: Oxygen Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Oxygen Physical data, chemical properties, and health effects.
- Visual Elements: Oxygen Animation, uses, physical information, and key isotopes.