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Technical data for Polonium

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

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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion13 kJ/mol
Heat of Vaporization100 kJ/mol
Heat of CombustionN/A
Specific HeatN/A
Adiabatic IndexN/A
Neel PointN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Bulk physical properties
Density9.196 g/cm3
Density (Liquid)N/A
Molar Volume0.000022727
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 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
Heat of CombustionN/A
DOT Hazard ClassN/A
DOT NumbersN/A
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

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

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
Decay ModeAlphaEmission
Quantum Numbers3P2
Neutron Cross Section0.5
Neutron Mass AbsorptionN/A
Known Isotopes
188Po, 189Po, 190Po, 191Po, 192Po, 193Po, 194Po, 195Po, 196Po, 197Po, 198Po, 199Po, 200Po, 201Po, 202Po, 203Po, 204Po, 205Po, 206Po, 207Po, 208Po, 209Po, 210Po, 211Po, 212Po, 213Po, 214Po, 215Po, 216Po, 217Po, 218Po, 219Po, 220Po
Stable Isotopes
Isotopic Abundances


Notes on the properties of Polonium:

Atomic Weight: 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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