Technical data for Astatine

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 Point575 K
Absolute Boiling PointN/A
Heat of Fusion6 kJ/mol
Heat of Vaporization40 kJ/mol
Heat of CombustionN/A
Specific HeatN/A
Thermal Conductivity2 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
DensityN/A
Density (Liquid)N/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
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockp
Group17
Period6
Electron Configuration[Xe]4f145d106s26p5
ColorSilver
Discovery
1940 in United States
Gas phaseN/A
CAS NumberCAS7440-68-8

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 MeteoritesNone
% in Earth's CrustNone
% in OceansNone
% in HumansNone

Atomic dimensions and structure
Atomic Radius127 pm
Covalent RadiusN/A
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-Life8.06 h
Lifetime11.7 h

Notes on the properties of Astatine:
Atomic Weight: Atomic mass number given for longest lived isotope.