Periodic Table of Elements

Element Thallium - Tl

Comprehensive data on the chemical element Thallium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Thallium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

Thallium Menu

Overview of Thallium

Thallium's Name in Other Languages

  • Latin: Thallium
  • Czech: Thallium
  • Croatian: Talij
  • French: Thallium
  • German: Thallium - s
  • Italian: Tallio
  • Norwegian: Thallium
  • Portuguese: Tálio
  • Russian: Таллий
  • Spanish: Talio
  • Swedish: Tallium

Atomic Structure of Thallium

Chemical Properties of Thallium

Physical Properties of Thallium

Regulatory / Health

  • CAS Number
    • 7440-28-0
  • OSHA Permissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSH Recommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: 0.00048
    • Bone/p.p.m: 0.002
    • Liver/p.p.m: 0.004-0.033
    • Muscle/p.p.m: 0.07
    • Daily Dietary Intake: 0.0015 mg
    • Total Mass In Avg. 70kg human: 0.5 mg
  • Discovery Year: 1861
  • Name Origin:
    Greek: thallos (young shoot/green twig) from a bright-green line in its spectrum.
  • Abundance of Thallium:
    • Earth's Crust/p.p.m.: 0.6
    • Seawater/p.p.m.: 0.000014
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): 8
  • Sources of Thallium:
    Found in iron pyrites, crookesite, hutchinsonite and lorandite. It is generally obtained as the by-product of zinc and lead smelting. Annual world wide production is around 30 tons.
  • Uses of Thallium:
    Its compounds are used in rat and ant poisons. Also for detecting infrared radiation and heart muscle research.
  • Additional Notes:
    While thallium was discovered by William Crookes in 1861, it was firs isolated by C.A. Lamy in 1862 in Paris France

Thallium Menu


A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Related Resources

Citing this page

If you need to cite this page, you can copy this text: