Germanium

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