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WebElements: Thallium
Extensive information on history, uses, occurrence, compounds, and properties.
It's Elemental: Thallium
Basic physical and historical information.
Wikipedia: Thallium
Properties of the element, including its history, applications, and charateristics.
Visual Elements: Thallium
Image, source, uses, physical information, and key isotopes.
Lenntech: Thallium
Physical data, chemical properties, health and environmental effects.
ChemGlobe: Thallium
Electronic, thermal, and steric data along with an isotope table.
EnvironmentalChemistry.com: Thallium
Atomic structure, chemical and physical properties, and table of nuclides.
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