View source for Template:Infobox astatine

{{infobox element
|engvar ={{{engvar|}}}
|name   =astatine
|symbol =At
|Z      =85
|number =85
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[polonium]]
|right=[[radon]]
|above=[[iodine|&nbsp;I&nbsp;]]
|below=[[tennessine|Ts]]
|appearance=unknown, probably metallic
|image name=
|electrons per shell=2, 8, 18, 32, 18, 7
|phase=solid
|phase comment=''(predicted)''
|density gplstp=
|density gpcm3nrt= 8.91–8.95
|density gpcm3nrt comment=''(estimated)''<ref name=Arblaster>{{cite book |editor-last1= Arblaster|editor-first1= JW|last2= |first2= |last3= |first3=| date=2018 |title= Selected Values of the Crystallographic Properties of Elements|location=Materials Park, Ohio|publisher= ASM International|page=604 |isbn=978-1-62708-154-2}}</ref>
|density gpcm3mp=
|molar volume=23.6
|molar volume ref=
|molar volume comment=''(estimated)''<ref name=Arblaster/>
|melting point prefix=
|melting point K=
|melting point C=
|melting point F=
|boiling point prefix=
|boiling point K=
|boiling point C=
|boiling point F=
|boiling point comment=
|triple point K=
|triple point kPa=
|critical point K=
|critical point MPa=
|heat fusion=
|heat vaporization=
|heat vaporization ref=
|heat capacity=
|vapor pressure 1=
|vapor pressure 10=
|vapor pressure 100=
|vapor pressure 1 k=
|vapor pressure 10 k=
|vapor pressure 100 k=
|vapor pressure comment=
|crystal structure=face-centered cubic
|crystal structure comment=''(predicted)''<ref name="Hermann">{{cite journal
|doi=10.1103/PhysRevLett.111.116404|title=Condensed Astatine: Monatomic and Metallic|year=2013|last1=Hermann|first1=A.|last2=Hoffmann|first2=R.|last3=Ashcroft|first3=N. W.|journal=Physical Review Letters|volume=111|issue=11|pages=116404-1–116404-5|bibcode=2013PhRvL.111k6404H|pmid=24074111}}</ref>
|electronegativity=
|number of ionization energies=1
|ionization energy 1=899.003
|ionization energy 1 ref=<ref name=1IP>{{cite journal |last1=Rothe |first1=S. |last2=Andreyev |first2=A. N. |last3=Antalic |first3=S. |last4=Borschevsky |first4=A. |last5=Capponi |first5=L. |last6=Cocolios |first6=T. E. |last7=De Witte |first7=H. |last8=Eliav |first8=E. |last9=Fedorov |first9=D. V. | display-authors=8
|year=2013 |title=Measurement of the First Ionization Potential of Astatine by Laser Ionization Spectroscopy |journal=Nature Communications |volume=4 |doi=10.1038/ncomms2819 |url=https://www.researchgate.net/publication/236836716_Measurement_of_the_first_ionization_potential_of_astatine_by_laser_ionization_spectroscopy |last10=Fedosseev |first10=V. N. |last11=Fink |first11=D. A. |last12=Fritzsche |first12=S. |last13=Ghys |first13=L. |last14=Huyse |first14=M. |last15=Imai |first15=N. |last16=Kaldor |first16=U. |last17=Kudryavtsev |first17=Yuri |last18=Köster |first18=U. |last19=Lane |first19=J. F. W. |last20=Lassen |first20=J. |last21=Liberati |first21=V. |last22=Lynch |first22=K. M. |last23=Marsh |first23=B. A. |last24=Nishio |first24=K. |last25=Pauwels |first25=D. |last26=Pershina |first26=V. |last27=Popescu |first27=L. |last28=Procter |first28=T. J. |last29=Radulov |first29=D. |last30=Raeder |first30=S. |pages=1–6 |pmid=23673620 |pmc=3674244|bibcode=2013NatCo...4E1835R }}</ref>
|atomic radius=
|covalent radius=
|Van der Waals radius=
|magnetic ordering=
|electrical resistivity=
|electrical resistivity at 0=
|electrical resistivity at 20=
|thermal conductivity=
|thermal conductivity 2=
|thermal diffusivity=
|thermal expansion=
|thermal expansion at 25=
|speed of sound=
|speed of sound rod at 20=
|speed of sound rod at r.t.=
|magnetic susceptibility=
|magnetic susceptibility ref=
|Young's modulus=
|Shear modulus=
|Bulk modulus=
|Poisson ratio=
|Mohs hardness=
|Vickers hardness=
|Brinell hardness=
|CAS number=7440-68-8
|discovered by=[[Dale R. Corson]], [[Kenneth Ross MacKenzie]], [[Emilio Segrè]]
|discovery date=1940
|naming={{ety|grc|''ἄστατος'' (ástatos)|unstable}}
|QID=Q999
}}<!--

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