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Technical data for Holmium

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

Overview
NameHolmium
SymbolHo
Atomic Number67
Atomic Weight164.93033
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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion17 kJ/mol
Heat of Vaporization265 kJ/mol
Specific Heat165 J/(kg K)[note]
Adiabatic IndexN/A
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
Mohs Hardness1.65[note]
Vickers Hardness481 MPa
Bulk Modulus40 GPa
Shear Modulus26 GPa
Young Modulus64 GPa
Poisson Ratio0.23
Refractive IndexN/A
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, 4100 kJ/mol

Health and Safety
DOT Hazard Class
4.1
DOT Numbers3089
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period6
SeriesLanthanide
Electron Configuration[Xe]6s24f11
ColorSilver
Discovery
1878 in Switzerland
Gas phaseN/A
CAS NumberCAS7440-60-0
CID Number
CID23988
RTECS NumberN/A

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 m3/Kg
Molar Magnetic Susceptibility9.05467×10-7 m3/mol
Volume Magnetic Susceptibility0.0482845

Abundances
% in Universe5×10-8%
% in Sun0%
% 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 Radius192 pm
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
Decay ModeN/A
Quantum Numbers4I15/2
Neutron Cross Section64
Neutron Mass Absorption0.015
Known Isotopes
140Ho, 141Ho, 142Ho, 143Ho, 144Ho, 145Ho, 146Ho, 147Ho, 148Ho, 149Ho, 150Ho, 151Ho, 152Ho, 153Ho, 154Ho, 155Ho, 156Ho, 157Ho, 158Ho, 159Ho, 160Ho, 161Ho, 162Ho, 163Ho, 164Ho, 165Ho, 166Ho, 167Ho, 168Ho, 169Ho, 170Ho, 171Ho, 172Ho, 173Ho, 174Ho, 175Ho
Stable Isotopes
165Ho
Isotopic Abundances
165Ho100%


Notes on the properties of Holmium:

Mohs Hardness: converted from Vickers scale

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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