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Thallium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Thallium
Symbol: Tl
Atomic Number: 81
Atomic Mass: 204.3833 amu
Melting Point: 303.5 °C (576.65 K, 578.3 °F)
Boiling Point: 1457.0 °C (1730.15 K, 2654.6 °F)
Number of Protons/Electrons: 81
Number of Neutrons: 123
Classification: Other Metals
Crystal Structure: Hexagonal
Density @ 293 K: 11.85 g/cm3
Color: bluish

Atomic Structure

[Bohr Model of Thallium]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 18
    Sixth Energy Level: 3


Isotope Half Life
Tl-2001.08 days
Tl-2013.03 days
Tl-20212.23 days
Tl-2043.78 years
Tl-2064.2 minutes
Tl-2074.77 minutes
Tl-2083.05 minutes
Tl-2092.2 minutes
Tl-2101.3 minutes


Date of Discovery: 1861
Discoverer: Sir William Crookes
Name Origin: From the Greek word thallos (young shoot)
Uses: rat and ant poisons, detecting infrared radiation
Obtained From: crookesite, hutchinsonite, lorandite

Related Links

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MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Thallium. <http://www.chemicalelements.com/elements/tl.html>.

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