It's Elemental: Lanthanum
Basic physical and historical information.
Wikipedia: Lanthanum
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Lanthanum
Atomic structure, chemical and physical properties, and table of nuclides.
ChemGlobe: Lanthanum
Electronic, steric, and thermal data along with an isotopes table.
LANL: Lanthanum
Sources, properties, isotopes, and uses.
ChemicalElements.com: Lanthanum
Basic information, atomic structure, and isotopes.
Visual Elements: Lanthanum
Image, appearance, source, uses, and general and physical information.
Lenntech: Lanthanum
Physical data, chemical properties, health and environmental effects.
Lanthanum
Data tables and historic information.
WebElements: Lanthanum
Extensive information on history, uses, occurrence, compounds, and properties.
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