Science: Chemistry: Elements: Helium
Britannica Nobel Prize: Helium
Detailed overview and data.
Electronic, thermal, and steric data along with basic information.
Basic information, atomic structure, and table of isotopes.
History, sources, properties, isotopes, and uses.
Atomic structure, chemical and physical properties, and table of nuclides.
Especiál Gas Inc.: Helium
Numeric data, uses, and general information.
Data tables and historic information.
It's Elemental: Helium
Basic physical and historical information.
History, sources, properties, and uses.
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).
Visual Elements: Helium
Image, animation, discovery, uses, physical information, and key isotopes.
Extensive information on history, uses, occurrence, and properties of the element.
Properties of the element, including its history, applications, and characteristics.
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