- Visual Elements: Helium - http://www.chemsoc.org/viselements/pages/helium.html
- Image, animation, discovery, uses, physical information, and key isotopes.
- It's Elemental: Helium - http://education.jlab.org/itselemental/ele002.html
- Basic physical and historical information.
- ChemicalElements.com: Helium - http://www.chemicalelements.com/elements/he.html
- Basic information, atomic structure, and table of isotopes.
- Especiál Gas Inc.: Helium - http://www.c-f-c.com/specgas_products/helium.htm
- Numeric data, uses, and general information.
- USGS Minerals Information: Helium - http://minerals.usgs.gov/minerals/pubs/commodity/helium/
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- Corrosionsource.com: Helium - http://www.corrosionsource.com/handbook/periodic/2.htm
- History, sources, properties, isotopes, and uses.
- EnvironmentalChemistry.com: Helium - http://environmentalchemistry.com/yogi/periodic/he.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Helium - http://www.lenntech.com/periodic-chart-elements/he-en.htm
- Physical data, chemical properties, and health effects.
- Wikipedia: Helium - http://en.wikipedia.org/wiki/helium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Helium - http://periodic.lanl.gov/elements/2.html
- History, sources, properties, and uses.
- ChemGlobe: Helium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/2.html
- Electronic, thermal, and steric data along with basic information.
- WebElements: Helium - http://www.webelements.com/webelements/elements/text/he/key.html
- Extensive information on history, uses, occurrence, and properties of the element.
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