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ChemicalElements.com: Helium
Basic information, atomic structure, and table of isotopes.
Corrosionsource.com: Helium
History, sources, properties, isotopes, and uses.
EnvironmentalChemistry.com: Helium
Atomic structure, chemical and physical properties, and table of nuclides.
Especiál Gas Inc.: Helium
Numeric data, uses, and general information.
It's Elemental: Helium
Basic physical and historical information.
Lenntech: Helium
Physical data, chemical properties, and health effects.
USGS Minerals Information: Helium
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
WebElements: Helium
Extensive information on history, uses, occurrence, and properties of the element.
Wikipedia: Helium
Properties of the element, including its history, applications, and characteristics.
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