Tungsten

WebElements: Ytterbium WebElements: Ytterbium- Extensive information on history, uses, occurrence, compounds, and properties. Wikipedia: Ytterbium Wikipedia: Ytterbium- Properties of the element, including its history, applications, and characteristics. Lenntech: Ytterbium Lenntech: Ytterbium- Physical data, chemical properties, health and environmental effects. EnvironmentalChemistry.com: Ytterbium EnvironmentalChemistry.com: Ytterbium- Atomic structure, chemical and physical properties, and table of nuclides. ChemicalElements.com: Ytterbium ChemicalElements.com: Ytterbium- Basic information, atomic structure, and isotopes. It's Elemental: Ytterbium It's Elemental: Ytterbium- Basic physical and historical information.