Arsenic Elemental Symbol

French German Italian Portuguese Spanish Swedish
Arsenic Arsen Arsenico Arsênic Arsénico Arsenik

Arsenic(As) atomic and molecular weight, atomic number and elemental symbolArsenic is a Block P, Group 15, Period 4 element. Arsenic Bohr ModelThe number of electrons in each of Arsenic's shells is 2, 8, 18, 5 and its electron configuration is [Ar] 3d10 4s2 4p3. Elemental ArsenicThe arsenic atom has a radius of and its Van der Waals radius is In its elemental form, CAS 1327-53-3, arsenic has a metallic grey appearance. Arsenic is found in numerous minerals including arsenolite (As2O3), arsenopyrite (FeAsS), loellingite (FeAs2), orpiment (As2S3), and realgar (As4S4). Arsenic was discovered in the early Bronze Age, circa 2500 BC. It was first isolated by Albertus Magnus in 1250.

Arsenic has numerous applications as a semiconductor and other electronic applications as Indium arsenide, silicon arsenide and tin arsenide. Arsenic is finding increasing uses as a doping agent in solid-state devices such as transistors. Gallium arsenide is used as a laser material to convert electricity directly into coherent light. Arsenic is used in bronzing and for hardening and improving the sphericity of shot. Due to their toxicity, arsenic compounds are used in insecticides and wood preservation. High Purity (99.9999%) Arsenic Oxide (As2O3) PowderHigh Purity (99.99999%) Arsenic (As)Sputtering TargetArsenic is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. Arsenic nanoparticles and nanopowders provide ultra-high surface area which nanotechnology research and recent experiments demonstrate function to create new and unique properties and benefits. Oxides are available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Arsenic is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Though inorganic arsenic is extremely toxic, even in very small amounts, other forms of arsenic have proven safe and even potentially beneficial to humans. Safety data for Arsenic and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab below.

  • Properties
  • Safety Data
  • Products
  • Research
  • Isotopes
  • Other Elements

Arsenic Properties

Symbol: As Melting Point: 616 oC, 1140.8 oF, 889.15 K
Atomic Number: 33 Boiling Point: Sublimes
Atomic Weight: 74.92 Density: 5.778 kg/m³
Element Category: metalloid Liquid Density @ Melting Point: 5.22 g·cm−3
Group, Period, Block: 15 (pnictogens), 4, p Specific Heat: 0.328 kJ/kg °K
    Heat of Vaporization 31.9 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 27.7 kJ mol-1
Electrons: 33 Thermal Conductivity: W/cm/ K @ 298.2 K
Protons: 33 Thermal Expansion: N/A
Neutrons: 42 Electrical Resistivity: α-metallic form, 260 nΩ · m at 0 oC
Electron Configuration: [Ar] 3d104s24p3 Electronegativity: 2.18 (pauling scale)
Atomic Radius: 119 pm Tensile Strength: N/A
Covalent Radius: 119±4 pm Molar Heat Capacity: 24.64 J·mol−1·K−1
Van der Waals radius: 185 pm Young's Modulus: 8 GPa
Oxidation States: 5, 3, -3 Shear Modulus: N/A
Phase: Solid Bulk Modulus: 22 GPa
Crystal Structure: simple trigonal Poisson Ratio: N/A
Magnetic Ordering: diamagnetic Mohs Hardness: 3.5
1st Ionization Energy: 944.46 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 1797.82 kJ mol-1 Brinell Hardness: 1440 MPa
3rd Ionization Energy: 2735.48 kJ mol-1 Speed of Sound: N/A
CAS Number: 7440-38-2 Abundance in typical human body, by weight: 50 ppb
ChemSpider ID: 4514330 Abundance in typical human body, by atom: 4 ppb
PubChem CID: 7440-38-2 Abundance in universe, by weight: 8 ppb
MDL Number: MFCD00085309 Abundance in universe, by atom: 0.1 ppb
EC Number: 231-148-6 Discovered By: Ancients
Beilstein Number: N/A Discovery Date: Bronze Age circa 2500 BC
SMILES Identifier: [AsH3]  
InChI Identifier: InChI=1S/As Other Names: Arsen, Arsenico, Arsenik

Health, Safety & Transportation Information for Arsenic

Material Safety Data Sheet MSDS
Signal Word Danger
Hazard Statements H301-H331-H410
Hazard Codes T, N
Risk Codes 23/25-50/53
Safety Precautions 20/21-28-45-60-61
RTECS Number CG0525000
Transport Information UN 1558 6.1/PG 2
WGK Germany 3
Globally Harmonized System of
Classification and Labelling (GHS)
Skull and Crossbones-Acute Toxicity  Environment-Hazardous to the aquatic environment  

Arsenic Products

Metal Forms  •  Compounds  •  Alloys  •  Oxide Forms  •  Organometallic Compounds
Sputtering Targets  •  Nanomaterials  •  Semiconductor Materials


Arsenic Acetate
Arsenic Bromide
Arsenic Carbide
Arsenic Chloride
Arsenic Chloride Solution
Arsenic Hydride AsH3
Arsenic Diiodide As2I4
Arsenic(III) Iodide AsI3
Arsenic(III) Oxide As2O3
Arsenic(V) Oxide As2O5
Arsenic(V) Oxide Hydrate
Barium Arsenate
Bismuth Arsenate
Calcium Arsenate
Copper Arsenate
Diarsine (Arsenic Hydride) As2H4
Iron Arsenate
Lead Arsenate
Lithium Arsenate
Lithium Hexafluoroarsenate(V)
Nickel Arsenate
Potassium Arsenate
Potassium Arsenate Monobasic
Potassium Hexafluoroarsenate(V)
Potassium Titanyl Arsenate
Rubidium Dihydrogenarsenate
Silver Arsenate
Silver Hexafluoroarsenate(V)
Sodium Arsenate
Sodium (meta)arsenite
Sodium Hexafluoroarsenate(V)
Sodium Hydrogen Arsenate Heptahydrate
Strontium Arsenate
Zinc Arsenate

Sputtering Targets

Arsenic Oxide Rotatable Sputtering Target
Arsenic Oxide Sputtering Target
Arsenic Phosphide Sputtering Target
Arsenic Rotatable Sputtering Target
Arsenic Selenide Sputtering Target
Arsenic Sputtering Target
Arsenic Sulfide Sputtering Target
Arsenic Telluride Sputtering Target
Cadmium Arsenide Sputtering Target
Gallium Arsenide Sputtering Target
Gold Arsenic Sputtering Target
Indium Arsenide Sputtering Target
Silicon Arsenide Sputtering Target
Tin Arsenide Sputtering Target
Zinc Arsenide Sputtering Target

Organometallic Compounds

Arsenic Ethoxide
Dimethylarsinic Acid
Cacodylic Acid Sodium Salt
Cacodylic Acid Sodium Salt Trihydrate
Tetraphenylarsonium (V) Chloride Hydrate
Tetraphenylarsonium (V) Chloride Hydrochloride Hydrate
Crystal/ Semiconductor Materials

Triphenylarsine Oxide
Aluminum Arsenide
Antimony Arsenide
Arsenic Phosphide
Arsenic Selenide
Arsenic Sulfide
Arsenic Telluride
Arsenic Telluride Lump
Cadmium Arsenide
Cadmium(IV) Arsenide
Calcium Arsenide
Chromium Arsenide
Cobalt Arsenide CoAs2
Cobalt Arsenide CoAs3
Erbium Arsenide
Europium Arsenide
Gallium Aluminum Arsenic Granules
Gallium Aluminum Arsenic Powder
Gallium Aluminum Arsenic Lump
Gadolinium Arsenide
Gallium Arsenide
Gallium Arsenide Wafer
Gallium Arsenide Windows
Gallium Indium Arsenide
Gallium Arsenide Single Crystal Substrate
Germanium Arsenide
Indium Aluminum Arsenic Granule
Indium Aluminum Arsenic Lump
Indium Aluminum Arsenic Powder
Indium Arsenide
Indium Arsenide Wafer
Indium Phosphide Arsenide
Indium Gallium Arsenic Granules
Indium Gallium Arsenic Lump
Indium Gallium Arsenic Powder
Indium Gallium Phosphorus Arsenic Granules
Indium Gallium Phosphorus Arsenic Powder
Indium Gallium Phosphorus Arsenic Lump
Lanthanum Arsenide
Lead Tin Arsenic Granules
Lead Tin Arsenic Lump
Lead Tin Arsenic Powder
Lutetium Arsenide
Magnesium Arsenide
Manganese Arsenide
Neodymium Arsenide
Nickel Arsenide
Samarium Arsenide
Silicon Arsenide
Terbium Arsenide
Tin Arsenide
Ytterbium Arsenide
Yttrium Arsenide
Zinc Arsenide
Zinc(IV) Arsenide
Zirconium Arsenide

Oxide Forms

Arsenic Oxide Nanopowder
Arsenic Oxide Pellets
Arsenic Oxide Pieces
Arsenic Oxide Powder
Arsenic Oxide Rotatable Sputtering Target
Arsenic Oxide Shot
Arsenic Oxide Sputtering Target
Arsenic Oxide Tablets

Recent Research & Development for Arsenic

  • Autophagy in arsenic carcinogenesis. Qi Y, Li H, Zhang M, Zhang T, Frank J, Chen G. Exp Toxicol Pathol. 2014.
  • Cathodic stripping voltammetric determination of arsenic in sugarcane brandy at a modified carbon nanotube paste electrode. Teixeira MC, Tavares Ede F, Saczk AA, Okumura LL, Cardoso Md, Magriotis ZM, de Oliveira MF. Food Chem. 2014.
  • Concentrations and health risks of lead, cadmium, arsenic, and mercury in rice and edible mushrooms in China. Fang Y, Sun X, Yang W, Ma N, Xin Z, Fu J, Liu X, Liu M, Mariga AM, Zhu X, Hu Q. Food Chem. 2014 Mar.
  • Inorganic arsenic in seafood: Does the extraction method matter? Pétursdóttir AH, Gunnlaugsdóttir H, Krupp EM, Feldmann J. Food Chem. 2014 May
  • The intake of inorganic arsenic from long grain rice and rice-based baby food in Finland - Low safety margin warrants follow up. Rintala EM, Ekholm P, Koivisto P, Peltonen K, Venäläinen ER. Food Chem. 2014 May
  • A need for determination of arsenic species at low levels in cereal-based food and infant cereals. Validation of a method by IC-ICPMS. Llorente-Mirandes T, Calderón J, Centrich F, Rubio R, López-Sánchez JF. Food Chem. 2014 Mar.
  • Low-cost field test kits for arsenic detection in water. Das J, Sarkar P, Panda J, Pal P. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2014
  • Selected arsenic species: As(III), As(V) and dimethylarsenic acid (DMAA) in Xerocomus badius fruiting bodies. Niedzielski P, Mleczek M, Magdziak Z, Siwulski M, Kozak L. Food Chem. 2013 Dec.
  • Determination and identification of hydrophilic and hydrophobic arsenic species in methanol extract of fresh cod liver by RP-HPLC with simultaneous ICP-MS and ESI-Q-TOF-MS detection. Arroyo-Abad U, Lischka S, Piechotta C, Mattusch J, Reemtsma T. Food Chem. 2013 Dec 1.
  • Occupational exposure to arsenic and risk of nonmelanoma skin cancer in a multinational European study. Surdu S, Fitzgerald EF, Bloom MS, Boscoe FP, Carpenter DO, Haase RF, Gurzau E, Rudnai P, Koppova K, Févotte J, Vahter M, Leonardi G, Goessler W, Kumar R, Fletcher T. Int J Cancer. 2013 Nov.
  • Influence of compost on the mobility of arsenic in soil and its uptake by bean plants (Phaseolus vulgaris L.) irrigated with arsenite-contaminated water. Caporale AG, Pigna M, Sommella A, Dynes JJ, Cozzolino V, Violante A. J Environ Manage. 2013 Oct 15.
  • Second order non-linear optical activity of arsenic and antimony dithiolene complexes. Mitra J, Pal K, Sarkar S. Dalton Trans. 2013 Oct 14.
  • Characterization of arsenic trioxide resistant clones derived from Jurkat leukemia T cell line: Focus on PI3K/Akt signaling pathway. Roszak J, Smok-Pieniazek A, Nocun M, Stepnik M. Chem Biol Interact. 2013 Oct 5.
  • Influence of the Activity of Allobophora molleri in Microbial Activity and Metal Availability of Arsenic-Polluted Soils. Tejada M, Gómez I, Hernández T, García C. Arch Environ Contam Toxicol. 2013 Oct.
  • Gypsum addition to soils contaminated by red mud: implications for aluminium, arsenic, molybdenum and vanadium solubility. Lehoux AP, Lockwood CL, Mayes WM, Stewart DI, Mortimer RJ, Gruiz K, Burke IT. Environ Geochem Health. 2013 Oct.
  • SUMO1 negatively regulates the transcriptional activity of EVI1 and significantly increases its co-localization with EVI1 after treatment with arsenic trioxide. Singh S, Pradhan AK, Chakraborty S. Biochim Biophys Acta. 2013 Oct.
  • Arsenic removal using natural biomaterial-based sorbents. Ansone L, Klavins M, Viksna A. Environ Geochem Health. 2013 Oct.
  • The availability and mobility of arsenic and antimony in an acid sulfate soil pasture system. Tighe M, Lockwood PV, Ashley PM, Murison RD, Wilson SC. Sci Total Environ. 2013.
  • Arsenic and other trace elements in two catfish species from Paranaguá Estuarine Complex, Paraná, Brazil. Angeli JL, Trevizani TH, Ribeiro A, Machado EC, Figueira RC, Markert B, Fraenzle S, Wuenschmann S. Environ Monit Assess. 2013.
  • Phosphorus-arsenic interactions in variable-charge soils in relation to arsenic mobility and bioavailability. Bolan N, Mahimairaja S, Kunhikrishnan A, Choppala G. Sci Total Environ.

Arsenic Isotopes

Arsenic has one stable isotope: 75As.

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
75As 74.9215965 Stable 3/2-