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Technical data for Promethium

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

Overview
NamePromethium
SymbolPm
Atomic Number61
Atomic Weight145[note]
Density7.264 g/cm3
Melting Point1.1×103 °C
Boiling Point3×103 °C

Thermal properties
PhaseSolid
Melting Point1.1×103 °C
Boiling Point3×103 °C
Absolute Melting Point1373 K
Absolute Boiling Point3273 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion7.7 kJ/mol
Heat of Vaporization290 kJ/mol
Heat of CombustionN/A
Specific HeatN/A
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity15 W/(m K)
Thermal Expansion0.000011 K-1

Bulk physical properties
Density7.264 g/cm3
Density (Liquid)N/A
Molar Volume0.000019961
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk Modulus33 GPa
Shear Modulus18 GPa
Young Modulus46 GPa
Poisson Ratio0.28
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity15 W/(m K)
Thermal Expansion0.000011 K-1

Reactivity
Valence3
ElectronegativityN/A
ElectronAffinity50 kJ/mol
Ionization Energies
540, 1050, 2150, 3970 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 AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f56s2
ColorSilver
Discovery
1945 in United States
Gas phaseN/A
CAS NumberCAS7440-12-2
CID NumberN/A
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.3×106 S/m
Resistivity7.5×10-7 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 SunNone
% in MeteoritesNone
% in Earth's CrustNone
% in OceansNone
% in HumansNone

Atomic dimensions and structure
Atomic Radius205 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-Life17.73 y
Lifetime25.56 y
Decay ModeElectronCapture
Quantum Numbers6H5/2
Neutron Cross Section8×103
Neutron Mass AbsorptionN/A
Known Isotopes
126Pm, 127Pm, 128Pm, 129Pm, 130Pm, 131Pm, 132Pm, 133Pm, 134Pm, 135Pm, 136Pm, 137Pm, 138Pm, 139Pm, 140Pm, 141Pm, 142Pm, 143Pm, 144Pm, 145Pm, 146Pm, 147Pm, 148Pm, 149Pm, 150Pm, 151Pm, 152Pm, 153Pm, 154Pm, 155Pm, 156Pm, 157Pm, 158Pm, 159Pm, 160Pm, 161Pm, 162Pm, 163Pm
Stable Isotopes
Isotopic Abundances


Notes on the properties of Promethium:

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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