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Technical data for Praseodymium

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

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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion6.9 kJ/mol
Heat of Vaporization330 kJ/mol
Heat of CombustionN/A
Specific Heat193 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
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
Mohs HardnessN/A
Vickers Hardness400 MPa
Bulk Modulus29 GPa
Shear Modulus15 GPa
Young Modulus37 GPa
Poisson Ratio0.28
Refractive IndexN/A
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
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]4f36s2
ColorSilver
Discovery
1885 in Austria
Gas phaseN/A
CAS NumberCAS7440-10-0
CID NumberCID23942
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

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

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/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
Decay ModeN/A
Quantum Numbers4I9/2
Neutron Cross Section11.4
Neutron Mass Absorption0.0029
Known Isotopes
121Pr, 122Pr, 123Pr, 124Pr, 125Pr, 126Pr, 127Pr, 128Pr, 129Pr, 130Pr, 131Pr, 132Pr, 133Pr, 134Pr, 135Pr, 136Pr, 137Pr, 138Pr, 139Pr, 140Pr, 141Pr, 142Pr, 143Pr, 144Pr, 145Pr, 146Pr, 147Pr, 148Pr, 149Pr, 150Pr, 151Pr, 152Pr, 153Pr, 154Pr, 155Pr, 156Pr, 157Pr, 158Pr, 159Pr
Stable Isotopes
141Pr
Isotopic Abundances
141Pr100%


Notes on the properties of Praseodymium:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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