Thallium

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Image

Attribution: W. Oelen

Animated Thallium

History

From Greek thallos, meanin a green shoot or twig. Thallium was discovered spectroscopically in 1861 by Crookes. The element was named after the beautiful green spectral line, which identified the element. The metal was isolated both by Crookes and by Lamy in 1862 at about the same time.

Sources

Thallium occurs in crooksite, lorandite, and hutchinsonite. It is also present in pyrites and is recovered from the roasting of this ore in connection with the production of sulfuric acid. It is also obtained from the smelting of lead and zinc ores. Extraction is somewhat complex and depends on the source of the thallium. Manganese nodules, found on the ocean floor, contain thallium.

Uses

Thallium sulfate has been widely employed as a rodenticide and ant killer. It is odorless and tasteless, giving no warning of its presence. Its use, however, has been prohibited in the U.S. since 1975 as a household insecticide and rodenticide. The electrical conductivity of thallium sulfide changes with exposure to infrared light, and this compound is used in photocells. Thallium bromide-iodide crystals have been used as infrared optical materials. Thallium has been used, with sulfur or selenium and arsenic, to produce low melting glasses with become fluid between 125 and 150C. These glasses have properties at room temperatures similar to ordinary glasses and are said to be durable and insoluble in water. Thallium oxide has been used to produce glasses with a high index of refraction, and is used in the manufacture of photo cells. Thallium has been used in treating ringworm and other skin infections; however, its use has been limited because of the narrow margin between toxicity and therapeutic benefits.

General Info

AtomicNumber
81
Symbol
Tl
Name
Thallium

Atomic Info

Appearance
AtomicWeight
204.3833(2)
Color
A6544D
ElectronicConfiguration
[Xe] 4f14 5d10 6s2 6p1
ElectronegativityInPauling
2.04
AtomicRadiusInPM
148
IonRadiusInPM
150 (+1)
VanDerWaalsRadiusInPM
196
IEinKJmol
589
EAinKJmol
-19
OxidationStates
1, 3
StandardState
solid
BondingType
metallic
MeltingPoint
577
BoilingPoint
1746
Density
11.85
State
Post-transition metal
DiscoveredYear
1861