Chemical Elements.com - Thallium (Tl)

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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

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Tl-200	1.08 days
Tl-201	3.03 days
Tl-202	12.23 days
Tl-203	Stable
Tl-204	3.78 years
Tl-205	Stable
Tl-206	4.2 minutes
Tl-207	4.77 minutes
Tl-208	3.05 minutes
Tl-209	2.2 minutes
Tl-210	1.3 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

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