Characteristics: Silver-gray brittle, crystalline solid that darkens in moist air. Allotropic forms: black, amorphous solid (beta-arsenic); yellow, crystalline solid. Mohs hardness 3.5; insoluble in water, caustic and nonoxidizing acids. Attacked by HCl in presence of oxidant. Reacts with nitric acid. Low thermal conductivity; a semiconductor.

Derivation: Flue dust from smelting of copper, gold and lead, from which white arsenic (arsenic trioxide) is obtained as a byproduct, in varying degrees of purity. This is reduced with charcoal. Arsenic is no longer produced in the U.S.

Hazard: Arsenic and inorganic arsenic compounds are toxic by ingestion and inhalation. A known carcinogen. Exposure limits: 0.01 mg/m3 of air.

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Symbol: As
Atomic Number: 33
Atomic Weight: 74.9216
Density: 5.73gm/cc
Melting Point: 817 oC (28 Atm)
Boiling Point: 613 oC subl.
Thermal Conductivity: 0.502 W/cm/K @ 298.2 K
Electrical Resistivity: 33.3 microhm-cm @ 20 oC
Electronegativity: 2.0 Paulings
Specific Heat: 0.0785 Cal/g/K @ 25 oC
Heat of Vaporization: 7.75 K-cal/gm atom at 2467 oC
Heat of Fusion: 6.62 Cal/gm mole


TYPICAL ANALYSES - Impurities in ppm

Material / Purity:



















Arsenic Lump, 100 Gram Ampoule


Lump is sold pre-packaged in glass ampoules under dry argon. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.    





Arsenic Oxide, As2O3, Powder msds1

4N, 5N

Arsenic Selenide, As2Se3, 1/4" Pieces by Down

2N, 5N

Compounds are packaged to order and sold by the gram or kilogram. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.



Material Safety Data Sheet - MSDS
Arsenic MSDS
Technical Data Sheets
Understanding Mesh Sizes

Home Page Content Under Periodic Table


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