These applications are declining with the increasing recognition of the toxicity of arsenic and its compounds. Arsenic and its compounds, especially the trioxide, are used in the production of pesticides, treated wood products, herbicides, and insecticides. It is also a component of the III-V compound semiconductor gallium arsenide. Arsenic is a common n-type dopant in semiconductor electronic devices. The primary use of arsenic is in alloys of lead (for example, in car batteries and ammunition). It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a chemical element with the symbol As and atomic number 33.
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