Sites:
| Britannica Nobel Prize: Helium: Detailed overview and data. | | ChemGlobe: Helium: Electronic, thermal, and steric data along with basic information. | | 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. | | Helium: Data tables and historic information. | | It's Elemental: Helium: Basic physical and historical information. | | LANL: Helium: History, sources, properties, and uses. | | 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). | | Visual Elements: Helium: Image, animation, discovery, uses, physical information, and key isotopes. | | 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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Classical
