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Britannica Nobel Prize: Argon - Overview and basic data.
ChemGlobe: Argon - Electronic, thermal, and steric data along with basic information.
ChemicalElements.com: Argon - Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Argon - Atomic structure, chemical and physical properties, and table of nuclides.
Especiál Gas Inc.: Argon - Numeric data, uses, and general information.
It's Elemental: Argon - Basic physical and historical information.
LANL: Argon - Sources, properties, isotopes, and uses.
Lenntech: Argon - Physical data, chemical properties, health and environmental effects.
Visual Elements: Argon - General and physical information, uses, key isotopes, and ionisation energies.
Wikipedia: Argon - Details the properties of the element, including its history, applications, and characteristics.