Knowra Arsenic Arsenic Arsenic is a brittle, toxic metalloid with atomic number 33. It occurs naturally in minerals and is used in semiconductors, alloys, and other materials.
Arsenic speciation : The distribution of arsenic among chemical forms that differ in oxidation state, bonding, and biological availability. Speciation determines whether arsenic occurs as relatively mobile arsenite or arsenate in a given environment.
Gallium arsenide : A semiconductor compound of gallium and arsenic used in high-frequency and optoelectronic devices. It exploits arsenic in a compound semiconductor rather than as an elemental material.
Arsenopyrite : An iron arsenic sulfide mineral and one of the most abundant sources of arsenic in Earth's crust. Oxidation of arsenopyrite during mining and weathering can mobilize arsenic.
Arsenic poisoning : Illness caused by exposure to toxic arsenic compounds, with effects that vary by dose, chemical form, and duration. This is the direct health consequence of exposure to arsenic compounds.
Phosphorus : A reactive nonmetal with atomic number 15 and the same periodic-table group as arsenic. Arsenate resembles phosphate, but arsenic compounds disrupt processes that phosphorus normally supports.
Arsenite : Arsenic in the +3 oxidation state, commonly present in water as arsenous acid and its deprotonated forms. Its neutral forms can cross cell membranes and often make it more toxic than arsenate.
Indium arsenide : A narrow-bandgap semiconductor compound of indium and arsenic. Its electronic properties support infrared detectors and high-speed devices.
Realgar : A red-orange arsenic sulfide mineral with the formula As4S4. It is a naturally occurring arsenic ore and pigment mineral.
Carcinogenicity of arsenic : The ability of certain arsenic exposures to cause cancer, especially after prolonged exposure to inorganic arsenic. Long-term exposure is associated with cancers of the skin, lung, and bladder.
Antimony : A brittle metalloid with atomic number 51, located below arsenic in group 15. Its related chemistry makes antimony a useful comparison for arsenic’s metalloid behavior.
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