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What do you guys know about arsenic? Is it for an assay?

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geovanny1014 | eNotes Newbie

Posted March 15, 2013 at 6:14 PM via iOS

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What do you guys know about arsenic? Is it for an assay?

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astrosonuthird | Student | (Level 1) Valedictorian

Posted March 18, 2013 at 9:05 AM (Answer #2)

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Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.[5] Arsenic is a metalloid. It can exist in various allotropes, although only the gray form has important use in industry. The main use of metallic arsenic is for strengthening alloys of copper and especially lead (for example, in car batteries). Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the most common semiconductor in use 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, however. Arsenic is notoriously poisonous to multicellular life, although a few species of bacteria are able to use arsenic compounds as respiratory metabolites. Arsenic contamination of groundwater is a problem that affects millions of people across the world
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tjbrewer | Elementary School Teacher | (Level 2) Associate Educator

Posted March 15, 2013 at 10:12 PM (Answer #1)

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I know that Arsenic is a semi-metallic poisonous element.  Used in the past as rat poison, and is commonly found in insecticides and other pesticides.  Element 33 Symbol As, Atomic mass 75. 

It's popularly used as an assassination poison in literature and other fictitious works. 

It conducts electricity, is used to harden lead.  Was discovered in 1250 by Albertus Magnus.  Is naturally a gray brittle flaky mineral.  Appears in yellow, black and gray forms.  Gray Arsenic is the most common form, it melts at 817 C, at 28 times Atmospheric pressure.  It sublimes at 613 C under normal atmospheric pressure. 

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