Technical data for Erbium

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
Heat of Fusion19.9 kJ/mol
Heat of Vaporization285 kJ/mol
Heat of CombustionN/A
Specific Heat168 J/(kg K)[note]
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
Vickers Hardness589 MPa
Bulk Modulus44 GPa
Shear Modulus28 GPa
Young Modulus70 GPa
Poisson Ratio0.24
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

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f126s2
ColorSilver
Discovery
1842 in Sweden
Gas phaseN/A
CAS NumberCAS7440-52-0

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
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.