See also:

• Science: Chemistry: Elements: Metals  (0)

• 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.
• 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.