Arsenic

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Arsenic,  33As
Arsen 1a.jpg
General properties
Name, seembol arsenic, As
Pronunciation /ˈɑrsɨnɪk/ AR-sə-nik,
also /ɑrˈsɛnɪk/ ar-SEN-ik when attributive
Appearance metallic grey
Arsenic in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Iron (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Copper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Silver (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercury (transeetion metal)
Thallium (post-transeetion metal)
Lead (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)
P

As

Sb
germaniumarsenicselenium
Atomic nummer 33
Staundart atomic wicht (±) (Ar) 74.921595(6)
Element category   metalloid
Group, block group 15 (pnictogens), p-block
Period period 4
Electron configuration [Ar] 4s2 3d10 4p3
per shell
2, 8, 18, 5
Pheesical properties
Phase solid
Sublimation point 887 K ​(615 °C, ​1137 °F)
Density near r.t. 5.727 g/cm3
when liquid, at m.p. 5.22 g/cm3
Triple pynt 1090 K, ​3628[1] kPa
Creetical pynt 1673 K, ? MPa
Heat o fusion (grey) 24.44 kJ/mol
Heat o ? 34.76 kJ/mol
Molar heat capacity 24.64 J/(mol·K)
 pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 553 596 646 706 781 874
Atomic properties
Oxidation states 5, 3, 2, 1,[2] -3 ​mildly acidic oxide
Electronegativity Pauling scale: 2.18
energies
(mair)
Atomic radius empirical: 119 pm
Covalent radius 119±4 pm
Van der Waals radius 185 pm
Miscellanea
Crystal structur trigonal[3]
Simple trigonal crystal structure for arsenic
Thermal conductivity 50.2 W/(m·K)
Electrical resistivity 333 n Ω·m (at 20 °C)
Magnetic orderin diamagnetic[4]
Young's modulus 8 GPa
Bulk modulus 22 GPa
Mohs haurdness 3.5
Brinell haurdness 1440 MPa
CAS Registry Nummer 7440-38-2
History
Discovery Early Bronze Age (2500 BC)
First isolation Albertus Magnus (1250)
Maist stable isotopes
Main article: Isotopes o arsenic
iso NA hauf-life DM DE (MeV) DP
73As syn 80.3 d ε - 73Ge
γ 0.05D, 0.01D, e -
74As syn 17.78 d ε - 74Ge
β+ 0.941 74Ge
γ 0.595, 0.634 -
β 1.35, 0.717 74Se
75As 100% 75As is stable wi 42 neutrons
· references

Arsenic is a chemical element wi seembol As an atomic nummer 33. Arsenic occurs in mony minerals, uisually in conjunction wi sulfur an metals, an an aa as a pure elemental crystal. It wiis first documentit bi Albertus Magnus in 1250.[5] Arsenic is a metalloid. It can exist in various allotropes, altho anly the gray furm haes important uise in industry.

References[eedit | eedit soorce]

  1. Gokcen, N. A (1989). "The As (arsenic) system". Bull. Alloy Phase Diagrams 10: 11–22. doi:10.1007/BF02882166. 
  2. Ellis, Bobby D. (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.  |first2= missin |last2= in Authors list (help)
  3. Arsenic, mindat.org
  4. 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. 
  5. 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.