Arsenic

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Arsenic
33As
P

As

Sb
germaniumarsenicselenium
Appearance
metallic grey
General properties
Name, seembol, nummer arsenic, As, 33
Pronunciation /ˈɑrsɨnɪk/ AR-sə-nik,
also /ɑrˈsɛnɪk/ ar-SEN-ik when attributive
Element category metalloid
Group, period, block 15 (pnictogens), 4, p
Staundart atomic wicht 74.921595(6)
Electron confeeguration [Ar] 4s2 3d10 4p3
2, 8, 18, 5
Electron shells of arsenic (2, 8, 18, 5)
History
Discovery Early Bronze Age (2500 BC)
First isolation Albertus Magnus (1250)
Physical properties
Phase solid
Density (near r.t.) 5.727 g·cm−3
Liquid density at m.p. 5.22 g·cm−3
Sublimation pynt 887 K, 615 °C, 1137 °F
Triple pynt 1090 K (817°C), 3628[1] kPa
Creetical pynt 1673 K, ? MPa
Heat o fusion (grey) 24.44 kJ·mol−1
Heat o vaporization  ? 34.76 kJ·mol−1
Molar heat capacity 24.64 J·mol−1·K−1
Vapor 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 2.18 (Pauling scale)
Ionization energies
(more)
1st: 947.0 kJ·mol−1
2nt: 1798 kJ·mol−1
3rd: 2735 kJ·mol−1
Atomic radius 119 pm
Covalent radius 119±4 pm
Van der Waals radius 185 pm
Miscellanea
Crystal structure simple trigonal[3]
Arsenic has a simple trigonal crystal structure
Magnetic orderin diamagnetic[4]
Electrical resistivity (20 °C) 333 nΩ·m
Thermal conductivity 50.2 W·m−1·K−1
Young's modulus 8 GPa
Bulk modulus 22 GPa
Mohs hairdness 3.5
Brinell hairdness 1440 MPa
CAS registry nummer 7440-38-2
Most 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
· r

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. 
  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 (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.