Technical data for Polonium

Overview
NamePolonium
SymbolPo
Atomic Number84
Atomic Weight209[note]
Density9.196 g/cm3
Melting Point254 °C
Boiling Point962 °C

Thermal properties
PhaseSolid
Melting Point254 °C
Boiling Point962 °C
Absolute Melting Point527 K
Absolute Boiling Point1235 K
Heat of Fusion13 kJ/mol
Heat of Vaporization100 kJ/mol
Heat of CombustionN/A
Specific HeatN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Bulk physical properties
Density9.196 g/cm3
Density (Liquid)N/A
Molar Volume0.000022727
Thermal ConductivityN/A
Thermal ExpansionN/A

Reactivity
Valence6
Electronegativity2
ElectronAffinity183.3 kJ/mol
Ionization Energies
812.1 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of Allotropes
AlphaPolonium, BetaPolonium
Blockp
Group16
Period6
Electron Configuration[Xe]4f145d106s26p4
ColorSilver
Discovery
1898 in France
Gas phaseN/A
CAS NumberCAS7440-08-6

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.3×106 S/m
Resistivity4.3×10-7 m Ω
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 MeteoritesN/A
% in Earth's CrustN/A
% in Oceans2×10-18%
% in HumansNone

Atomic dimensions and structure
Atomic Radius135 pm
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureSimple Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
335.9, 335.9, 335.9 pm
Space Group NamePm-3m
Space Group Number221

Nuclear Properties
Half-Life102.1 y
Lifetime147.1 y

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