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- Thallium Metal (Tl) Synonyms:
thallium, Tl, thallium rod, thallium shot, thallium metal, CAS# 7440-28-0,
Chemical Name: Thallium
Chemical Formula: Tl
Thallium was discovered spectroscopically and is named for its green spectral line. It has a metallic luster when first exposed to air, but quickly develops a bluish-gray tone that resembles lead. Thallium is very soft and malleable, inelastic, and heavy. It occurs naturally as a mixture of two isotopes.
- Thallium Metal (Tl) Appearance:
Very similar to lead: soft and ductile heavy metal; shiny white at fresh cuts turning blue-grey; (alpha-thallium has a hexagonal crystalline structure and is converted at temperatures above 232°C into beta-thallium with cubic structure)
99.9%, 99.99%, and 99.999%
Rod and round shot
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Atomic Number
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81
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Molecular Weight (g/mol.)
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204.37
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Apparent Density (g/cm3)
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11.85
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Atomic Radius (pm)
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170
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Specific Heat @25°C (cal/g-°C)
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.031
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Melting Point (°C)
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303
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Boiling Point (°C)
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1457
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Thermal Conductivity (cal/s-cm°C)
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.093
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Brinell Hardness
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2
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Mohs Hardness
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1.2
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pH
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Vapour Pressure (Pa at 473°C)
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0.013
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Magnetic Ordering
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diamagnetic
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Crystallography
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hexagonal structure
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Used in photocells, infrared detectors, low-melting glass, and formerly in rodent and ant poisons.
Jars and drums
a) Listed. For further information please call the E.P.A. at 202.554.1404
b) View safety information from NIOSH
CAS# 7440-28-0
1707
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