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It's Elemental: Krypton
Basic physical and historical information.
EnvironmentalChemistry.com: Krypton
Atomic structure, properties, and table of nuclides.
Krypton
Data tables and historic information.
Lenntech: Krypton
Physical data, chemical properties, health and environmental effects.
LANL: Krypton
History, sources, isotopes, and uses.
Chemical Elements.com: Krypton
Basic information, atomic structure, and table of isotopes.
WebElements: Krypton
Extensive information on history, uses, occurrence, compounds, and properties of the element.
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