Technical data for Holmium

Overview
NameHolmium
SymbolHo
Atomic Number67
Atomic Weight164.93032
Density8.795 g/cm3
Melting Point1474 °C
Boiling Point2700 °C

Thermal properties
PhaseSolid
Melting Point1474 °C
Boiling Point2700 °C
Absolute Melting Point1747 K
Absolute Boiling Point2973 K
Heat of Fusion17 kJ/mol
Heat of Vaporization265 kJ/mol
Heat of CombustionN/A
Specific Heat165 J/(kg K)[note]
Neel Point132 K
Thermal Conductivity16 W/(m K)
Thermal Expansion0.0000112 K-1

Bulk physical properties
Density8.795 g/cm3
Density (Liquid)8.34 g/cm3
Molar Volume0.000018753
Brinell Hardness746 MPa
Vickers Hardness481 MPa
Bulk Modulus40 GPa
Shear Modulus26 GPa
Young Modulus65 GPa
Poisson Ratio0.23
Speed of Sound2760 m/s
Thermal Conductivity16 W/(m K)
Thermal Expansion0.0000112 K-1

Reactivity
Valence3
Electronegativity1.23
ElectronAffinity50 kJ/mol
Ionization Energies
581, 1140, 2204, 4.1×103 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f116s2
ColorSilver
Discovery
1878 in Switzerland
Gas phaseN/A
CAS NumberCAS7440-60-0

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.1×106 S/m
Resistivity9.4×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie Point20 K
Mass Magnetic Susceptibility5.49×10-6
Molar Magnetic Susceptibility9.05467×10-7
Volume Magnetic Susceptibility0.0482845

Abundances
% in Universe5×10-8%
% in SunNone
% in Meteorites5.9×10-6%
% in Earth's Crust0.00012%
% in Oceans2.2×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius226 pm
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
357.73, 357.73, 561.58 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
165Ho
Isotopic Abundances
165Ho100%

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