Template:Infobox arsenic

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germaniumarsenicselenium
P

As

Sb
Appearance
metallic grey
250px
General properties
Name, symbol, number arsenic, As, 33
Pronunciation /ˈɑrsənɪk/ ARS-ə-nik,
also /ɑrˈsɛnɪk/ ar-SEN-ik when attributive
Element category metalloid
Group, period, block 154, p
Standard atomic weight 74.92160(2)g·mol−1
Electron configuration [Ar] 4s2 3d10 4p3
Electrons per shell 2, 8, 18, 5 (Image)
Physical properties
Phase solid
Density (near r.t.) 5.727 g·cm−3
Liquid density at m.p. 5.22 g·cm−3
Sublimation point 887 K, 615 °C, 1139 °F
Triple point 1090 K (817°C), 3628 [1] kPa
Critical point 1673 K, ? MPa
Heat of fusion (grey) 24.44 kJ·mol−1
Heat of vaporization  ? 34.76 kJ·mol−1
Specific heat capacity (25 °C) 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
2nd: 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 rhombohedral
Magnetic ordering diamagnetic[3]
Electrical resistivity (20 °C) 333 nΩ·m
Thermal conductivity (300 K) 50.2 W·m−1·K−1
Young's modulus 8 GPa
Bulk modulus 22 GPa
Mohs hardness 3.5
Brinell hardness 1440 MPa
CAS registry number 7440-38-2
Most stable isotopes
Main article: Isotopes of arsenic
iso NA half-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 with 42 neutrons
Template:Template reference list
  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= missing |last2= in Authors list (help)
  3. 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.