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Britannica Nobel Prize: Krypton - Overview and basic data.
ChemGlobe: Krypton - Electronic, thermal, and steric data along with an isotope table.
Chemical Elements.com: Krypton - Basic information, atomic structure, and table of isotopes.
EnvironmentalChemistry.com: Krypton - Atomic structure, properties, and table of nuclides.
Especiál Gas Inc.: Krypton - Numeric data, uses, and general information.
It's Elemental: Krypton - Basic physical and historical information.
LANL: Krypton - History, sources, isotopes, and uses.
Lenntech: Krypton - Physical data, chemical properties, health and environmental effects.
Visual Elements: Krypton - General and physical information, uses, key isotopes, and ionisation energies.
What Does the Element Krypton Look Like? - Explanation with photographs.
Wikipedia: Krypton - Properties of the element, including its history, applications, and characteristics.