» ChemGlobe: Thallium - Electronic, thermal, and steric data along with an isotope table.
» ChemicalElements.com: Thallium - Basic information, atomic structure, and isotopes.
» EnvironmentalChemistry.com: Thallium - Atomic structure, chemical and physical properties, and table of nuclides.
» It's Elemental: Thallium - Basic physical and historical information.
» LANL: Thallium - History, sources, properties, handling, and uses.
» Lenntech: Thallium - Physical data, chemical properties, health and environmental effects.
» Thallium - Data tables and historic information.
» USGS Minerals Information: Thallium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
» Visual Elements: Thallium - Image, source, uses, physical information, and key isotopes.
» WebElements: Thallium - Extensive information on history, uses, occurrence, compounds, and properties.
» Wikipedia: Thallium - Properties of the element, including its history, applications, and characteristics.
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