Technical data for Praseodymium

Overview
NamePraseodymium
SymbolPr
Atomic Number59
Atomic Weight140.90765
Density6.64 g/cm3
Melting Point931 °C
Boiling Point3290 °C

Thermal properties
PhaseSolid
Melting Point931 °C
Boiling Point3290 °C
Absolute Melting Point1204 K
Absolute Boiling Point3563 K
Heat of Fusion6.9 kJ/mol
Heat of Vaporization330 kJ/mol
Heat of CombustionN/A
Specific Heat193 J/(kg K)[note]
Thermal Conductivity13 W/(m K)
Thermal Expansion6.7×10-6 K-1

Bulk physical properties
Density6.64 g/cm3
Density (Liquid)6.5 g/cm3
Molar Volume0.000021221
Brinell Hardness481 MPa
Vickers Hardness400 MPa
Bulk Modulus29 GPa
Shear Modulus15 GPa
Young Modulus37 GPa
Poisson Ratio0.28
Speed of Sound2280 m/s
Thermal Conductivity13 W/(m K)
Thermal Expansion6.7×10-6 K-1

Reactivity
Valence4
Electronegativity1.13
ElectronAffinity50 kJ/mol
Ionization Energies
527, 1020, 2086, 3761, 5551 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f36s2
ColorSilver
Discovery
1885 in Austria
Gas phaseN/A
CAS NumberCAS7440-10-0

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.4×106 S/m
Resistivity7×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Mass Magnetic Susceptibility4.23×10-7
Molar Magnetic Susceptibility5.9604×10-8
Volume Magnetic Susceptibility0.0028087

Abundances
% in Universe2×10-7%
% in Sun1×10-7%
% in Meteorites9.8×10-6%
% in Earth's Crust0.00086%
% in Oceans6×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius247 pm
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
367.25, 367.25, 1183.54 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
141Pr
Isotopic Abundances
141Pr100%

Notes on the properties of Praseodymium:
Specific Heat: Value given for solid phase.