Information valid for Tl-204 unless otherwise noted
[ATOM]

Thallium

 [ATOM]

Basic Information


Symbol: Tl
Atomic Number: 81
Mass: 204.383
Melting Point: 303.5
Boiling Point: 1457
Number of Protons/Electrons: 81
Number of Neutrons: 123
Classification: Other Metals
Crystal Structure: Hexagonal
Density: 11.85
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

Isotopes

Isotope Half Life
Tl-2001.08 days
Tl-2013.03 days
Tl-20212.23 days
Tl-203Stable
Tl-2043.78 years
Tl-205Stable
Tl-2064.2 minutes
Tl-2074.77 minutes
Tl-2083.05 minutes
Tl-2092.2 minutes
Tl-2101.3 minutes

Facts


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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