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