View source for Template:Infobox arsenic

{{Infobox element
|engvar={{{engvar|}}}
|name=arsenic
|allotropes=grey (most common), yellow, black 
|number=33
|symbol=As
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[Chemistry:Germanium|germanium]]
|right=[[Chemistry:Selenium|selenium]]
|above=[[Chemistry:Phosphorus|P]]
|below=[[Chemistry:Antimony|Sb]]
|category comment=
|group=15
|period=4
|block=p
|appearance=metallic grey
|image name=Arsen 1a.jpg
|electrons per shell=2, 8, 18, 5
|phase=
|phase comment=
|density gplstp=
|density gpcm3nrt=5.727
|density gpcm3mp=5.22
|sublimation point K=887
|sublimation point C=615
|sublimation point F=1137
|triple point K=1090
|triple point kPa=3628
|triple point ref=<ref name="Gokcen1989">{{cite journal|author=Gokcen, N. A|title=The As (arsenic) system|journal=Bull. Alloy Phase Diagrams|year=1989|volume=10|pages=11–22|doi=10.1007/BF02882166}}</ref>
|critical point K=1673
|critical point MPa=?
|heat fusion=grey: 24.44
|heat vaporization=34.76
|heat vaporization comment=(?)
|heat capacity=24.64
|vapor pressure 1=553
|vapor pressure 10=596
|vapor pressure 100=646
|vapor pressure 1 k=706
|vapor pressure 10 k=781
|vapor pressure 100 k=874
|vapor pressure comment=
|crystal structure=rhombohedral
|crystal structure ref=
|electronegativity=2.18
|number of ionization energies=4
|ionization energy 1=947.0
|ionization energy 2=1798
|ionization energy 3=2735
|atomic radius=119
|covalent radius=119±4
|Van der Waals radius=185
|magnetic ordering=[[diamagnetic]]
|magnetic ordering ref=<ref>{{cite book|url=https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf|chapter=Magnetic susceptibility of the elements and inorganic compounds|title=Handbook of Chemistry and Physics|edition=81|publisher=CRC press|isbn=0849304814|year=2000|editor= Lide, David R. }}</ref>
|electrical resistivity unit prefix=n
|electrical resistivity at 0=
|electrical resistivity at 20=333
|thermal conductivity=50.2
|thermal conductivity 2=
|thermal diffusivity=
|thermal expansion=5.6
|thermal expansion ref=<ref>{{cite book|author=Cverna, Fran |title=ASM Ready Reference: Thermal properties of metals|url=https://books.google.com/books?id=qvrq96gJFxIC&pg=PA8|date= 2002|publisher=ASM International|isbn=978-0-87170-768-0|pages=8–}} [http://www.owlnet.rice.edu/~msci301/ThermalExpansion.pdf pdf].</ref>
|thermal expansion comment=(at&nbsp;{{abbr|r.t.|room temperature}})
|thermal expansion at 25=
|speed of sound=
|speed of sound rod at 20=
|speed of sound rod at r.t.=
|magnetic susceptibility= −5.5·10<sup>−6</sup>
|magnetic susceptibility ref= <ref>{{Cite book|title=CRC, Handbook of Chemistry and Physics|last=Weast|first=Robert|publisher=Chemical Rubber Company Publishing|year=1984|isbn=0-8493-0464-4|location=Boca Raton, Florida|pages=E110|quote=|via=}}</ref>
|Young's modulus=8
|Shear modulus=
|Bulk modulus=22
|Poisson ratio=
|Mohs hardness=3.5
|Vickers hardness=
|Brinell hardness=1440
|CAS number=7440-38-2
|isotopes=
{{infobox element/isotopes_decay2 | mn=73 | sym=As | na=[[Physics:Synthetic radioisotope|syn]] | hl=80.3&nbsp;d | dm1=[[Physics:Electron capture|ε]] | de1=– | link1=germanium-73 | pn1=73 | ps1=Ge
|dm2=[[gamma radiation|γ]] | de2=0.05[[Physics:Delayed nuclear radiation|D]], 0.01D, [[Conversion electron|e]] | pn2= | ps2=– }}
{{infobox element/isotopes_decay4 | mn=74 | sym=As | na=syn | hl=17.8&nbsp;d | dm1=ε | de1=– | link1=germanium-74 | pn1=74 | ps1=Ge
|dm2=[[Physics:Positron emission|β<sup>+</sup>]] | de2=0.941 | pn2=74 | ps2=Ge
|dm3=γ | de3=0.595, 0.634 | pn3= | ps3=–
|dm4=[[Physics:Beta decay|β<sup>−</sup>]] | de4=1.35, 0.717 | link4=selenium-74 | pn4=74 | ps4=Se}}
{{infobox element/isotopes_stable | mn=75 | sym=As | na=100% | n=42 }}
|isotopes comment=
|discovered by=[[Alchemy and chemistry in the medieval Islamic world|Arabic alchemists]]
|discovery date=before AD 815
|QID=Q871
}}<!--

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