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Characteristic
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.
Phase at STP：solid
Appearance：metallic grey
Sublimation point：887 K (615 °C, 1137 °F)
Density (near r.t.)：5.727 g/cm3
when liquid (at m.p.)：5.22 g/cm3
Triple point：1090 K, 3628 kPa
Critical point：1673 K
Heat of fusion grey: 24.44 kJ/mol
Heat of vaporization：34.76 kJ/mol
Molar heat capacity：24.64 J/(mol·K)
Application
The primary use of arsenic is in alloys of lead (for example, in car batteries and ammunition). Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the second most commonly used semiconductor after doped silicon. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining due to the toxicity of arsenic and its compounds.
Characteristic
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.
Phase at STP：solid
Appearance：metallic grey
Sublimation point：887 K (615 °C, 1137 °F)
Density (near r.t.)：5.727 g/cm3
when liquid (at m.p.)：5.22 g/cm3
Triple point：1090 K, 3628 kPa
Critical point：1673 K
Heat of fusion grey: 24.44 kJ/mol
Heat of vaporization：34.76 kJ/mol
Molar heat capacity：24.64 J/(mol·K)
Application
The primary use of arsenic is in alloys of lead (for example, in car batteries and ammunition). Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the second most commonly used semiconductor after doped silicon. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. These applications are declining due to the toxicity of arsenic and its compounds.
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