Technical data for Promethium

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
Heat of Fusion7.7 kJ/mol
Heat of Vaporization290 kJ/mol
Heat of CombustionN/A
Specific HeatN/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
Bulk Modulus33 GPa
Shear Modulus18 GPa
Young Modulus46 GPa
Poisson Ratio0.28
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

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f56s2
ColorSilver
Discovery
1945 in United States
Gas phaseN/A
CAS NumberCAS7440-12-2

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
Stable Isotopes
Isotopic Abundances

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