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.
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