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Technical data for Erbium

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

Overview
NameErbium
SymbolEr
Atomic Number68
Atomic Weight167.259
Density9.066 g/cm3
Melting Point1497 °C
Boiling Point2868 °C

Thermal properties
PhaseSolid
Melting Point1497 °C
Boiling Point2868 °C
Absolute Melting Point1770 K
Absolute Boiling Point3141 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion19.9 kJ/mol
Heat of Vaporization285 kJ/mol
Heat of CombustionN/A
Specific Heat168 J/(kg K)[note]
Adiabatic IndexN/A
Neel Point82 K
Thermal Conductivity15 W/(m K)
Thermal Expansion0.0000122 K-1

Bulk physical properties
Density9.066 g/cm3
Density (Liquid)8.86 g/cm3
Molar Volume0.000018449
Brinell Hardness814 MPa
Mohs HardnessN/A
Vickers Hardness589 MPa
Bulk Modulus44 GPa
Shear Modulus28 GPa
Young Modulus70 GPa
Poisson Ratio0.24
Refractive IndexN/A
Speed of Sound2830 m/s
Thermal Conductivity15 W/(m K)
Thermal Expansion0.0000122 K-1

Reactivity
Valence3
Electronegativity1.24
ElectronAffinity50 kJ/mol
Ionization Energies
589.3, 1150, 2194, 4120 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]4f126s2
ColorSilver
Discovery
1842 in Sweden
Gas phaseN/A
CAS NumberCAS7440-52-0
CID NumberCID23980
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.2×106 S/m
Resistivity8.6×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie Point32 K
Mass Magnetic Susceptibility3.77×10-6
Molar Magnetic Susceptibility6.30566×10-7
Volume Magnetic Susceptibility0.0341788

Abundances
% in Universe2×10-7%
% in Sun1×10-7%
% in Meteorites0.000018%
% in Earth's Crust0.0003%
% in Oceans9×10-11%
% 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
355.88, 355.88, 558.74 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers3H6
Neutron Cross Section165
Neutron Mass Absorption0.036
Known Isotopes
143Er, 144Er, 145Er, 146Er, 147Er, 148Er, 149Er, 150Er, 151Er, 152Er, 153Er, 154Er, 155Er, 156Er, 157Er, 158Er, 159Er, 160Er, 161Er, 162Er, 163Er, 164Er, 165Er, 166Er, 167Er, 168Er, 169Er, 170Er, 171Er, 172Er, 173Er, 174Er, 175Er, 176Er, 177Er
Stable Isotopes
162Er, 164Er, 166Er, 167Er, 168Er, 170Er
Isotopic Abundances
162Er0.14%
164Er1.61%
166Er33.61%
167Er22.93%
168Er26.78%
170Er14.93%


Notes on the properties of Erbium:

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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