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ARSENIC (33As74.92159)

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Element Description

Arsenic, a steel-gray, semimetallic solid, is very brittle, crystalline and poisonous. Elemental arsenic occurs in two solid modifications: the ordinary, stable, metallic-gray form and the yellow form. It oxidizes in air and, when heated, is rapidly oxidized to arsenous oxide (AS<sub>2</sub>O<sub>3</sub>) with a garlic odor. Arsenic is used as a doping agent in semiconductor materials.

Property Name Property Value Property Name Property Value
Atomic Code (33As74.92159) Atomic Volume 131.1W/D
CAS # 7440-38-2 First Ionization Energy 231K-cal/g-mole
Electronegativity 2.0Pauling's
Melting Point 817°C(28atm) Covalent Radius 1.20Angstroms
Boiling Point 614°C(sublimes) Mohs Hardness @ 20°C 3.5
Density 5.778g/cm3 Linear Coefficient of Expansion @ 20°C 4.7x10-6K-1
Specific Heat @ 25°C 0.082cal/g°C Electrical Resistivity @ 20°C 33.3µΩ-cm
Heat of Fusion 88.5k-cal/g-atom Crystal Structure Rhombohedral
Heat of Sublimation 88.5k-cal/g-atom Magnetic Susceptibility @ 20°C -5.5x10-6cgs


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