HHomeBackground Color:He
LiBeAstatine Main PageBlack White GrayBCNOFNe
NaMgAstatine Pictures PageAlSiPSClAr
KCaAstatine Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg

Technical data for Astatine

Click any property name to see plots of that property for all the elements.

Overview
NameAstatine
SymbolAt
Atomic Number85
Atomic Weight210[note]
DensityN/A
Melting Point302 °C
Boiling PointN/A

Thermal properties
PhaseSolid
Melting Point302 °C
Boiling PointN/A
Absolute Melting Point577 K
Absolute Boiling PointN/A
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion6 kJ/mol
Heat of Vaporization40 kJ/mol
Specific HeatN/A
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity2 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
DensityN/A
Density (Liquid)N/A
Molar VolumeN/A
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk ModulusN/A
Shear ModulusN/A
Young ModulusN/A
Poisson RatioN/A
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity2 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence7
Electronegativity2.2
ElectronAffinity270.1 kJ/mol
Ionization Energies
920 kJ/mol

Health and Safety
DOT Hazard ClassN/A
DOT NumbersN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockp
Group17
Period6
SeriesHalogen
Electron Configuration[Xe]6s24f145d106p5
ColorSilver
Discovery
1940 in The United States
Gas phaseN/A
CAS NumberCAS7440-68-8
CID NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in UniverseN/A
% in SunN/A
% in Meteorites0%
% in Earth's Crust0%
% in Oceans0%
% in Humans0%

Atomic dimensions and structure
Atomic Radius127 pm
Covalent Radius150 pm
Van der Waals RadiusN/A
Crystal StructureN/A
Lattice AnglesN/A
Lattice ConstantsN/A
Space Group NameN/A
Space Group NumberN/A

Nuclear Properties
Half-Life8.055555555556 h
Lifetime11.66666666667 h
Decay ModeBetaPlusDecay
Quantum Numbers2P3/2
Neutron Cross SectionN/A
Neutron Mass AbsorptionN/A
Known Isotopes
193At, 194At, 195At, 196At, 197At, 198At, 199At, 200At, 201At, 202At, 203At, 204At, 205At, 206At, 207At, 208At, 209At, 210At, 211At, 212At, 213At, 214At, 215At, 216At, 217At, 218At, 219At, 220At, 221At, 222At, 223At
Stable Isotopes
None
Isotopic Abundances


Notes on the properties of Astatine:

Atomic Mass: Atomic mass number given for longest lived isotope.

Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

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