Airsenic is a chemical element wi seembol As an atomic nummer 33. Airsenic occurs in mony meenerals, uisually in conjunction wi sulfur an metals, an an aa as a pure elemental crystal. It wis first documentit bi Albertus Magnus in 1250.[6] Airsenic is a metalloid. It can exist in various allotropes, altho anly the gray furm haes important uise in industry.

Airsenic,  33As
Arsen 1a.jpg
General properties
Appearancemetallic grey
Staundart atomic wecht (Ar, staundart)74.921595(6)[1]
Airsenic in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
P

As

Sb
germaniumairsenicselenium
Atomic nummer (Z)33
Groupgroup 15 (pnictogens)
Periodperiod 4
Element category  metalloid
Blockp-block
Electron confeeguration[Ar] 4s2 3d10 4p3
Electrons per shell
2, 8, 18, 5
Pheesical properties
Phase (at STP)solit
Sublimation pynt887 K ​(615 °C, ​1137 °F)
Density (near r.t.)5.727 g/cm3
when liquid (at m.p.)5.22 g/cm3
Treeple pynt1090 K, ​3628[2] kPa
Creetical pynt1673 K, ? MPa
Heat o fusion(grey) 24.44 kJ/mol
Heat o vapourisation? 34.76 kJ/mol
Molar heat capacity24.64 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 553 596 646 706 781 874
Atomic properties
Oxidation states5, 3, 2, 1,[3] -3 ​mildly acidic oxide
ElectronegativityPauling scale: 2.18
Ionisation energies
Atomic radiusempirical: 119 pm
Covalent radius119±4 pm
Van der Waals radius185 pm
Coloyr lines in a spectral range
Spectral lines o Airsenic
Miscellanea
Creestal structurtrigonal[4]
Simple trigonal creestal structur for airsenic
Thermal conductivity50.2 W/(m·K)
Electrical resistivity333 n Ω·m (at 20 °C)
Magnetic orderindiamagnetic[5]
Young's modulus8 GPa
Bouk modulus22 GPa
Mohs haurdness3.5
Brinell haurdness1440 MPa
CAS Nummer7440-38-2
History
DiskiveryEarly Bronze Age (2500 BC)
First isolationAlbertus Magnus (1250)
Main isotopes o airsenic
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
73As syn 80.3 d ε 73Ge
γ -
74As syn 17.78 d ε 74Ge
β+ 74Ge
γ -
β 74Se
75As 100% stable
| references | in Wikidata

ReferencesEedit

  1. Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. Gokcen, N. A (1989). "The As (arsenic) system". Bull. Alloy Phase Diagrams. 10: 11–22. doi:10.1007/BF02882166.
  3. Ellis, Bobby D.; Charles, L. B. (2004). "Stabilized Arsenic(I) Iodide: A Ready Source of Arsenic Iodide Fragments and a Useful Reagent for the Generation of Clusters". Inorganic Chemistry. 43: 5981. doi:10.1021/ic049281s.
  4. Arsenic, mindat.org
  5. editor-in-chief, David R. Lide. (2000). "Magnetic susceptibility of the elements and inorganic compounds". Handbook of Chemistry and Physics (PDF) (81 ed.). CRC press. ISBN 0849304814.CS1 maint: extra text: authors leet (link)
  6. Emsley, John (2001). Nature's Building Blocks: An A-Z Guide to the Elements. Oxford: Oxford University Press. pp. 43, 513, 529. ISBN 0-19-850341-5.