Technical data for Terbium

Overview
NameTerbium
SymbolTb
Atomic Number65
Atomic Weight158.92534
Density8.219 g/cm3
Melting Point1356 °C
Boiling Point3230 °C

Thermal properties
PhaseSolid
Melting Point1356 °C
Boiling Point3230 °C
Absolute Melting Point1629 K
Absolute Boiling Point3503 K
Heat of Fusion10.8 kJ/mol
Heat of Vaporization295 kJ/mol
Heat of CombustionN/A
Specific Heat182 J/(kg K)[note]
Thermal Conductivity11 W/(m K)
Thermal Expansion0.0000103 K-1

Bulk physical properties
Density8.219 g/cm3
Density (Liquid)7.65 g/cm3
Molar Volume0.000019336
Brinell Hardness677 MPa
Vickers Hardness863 MPa
Bulk Modulus38.7 GPa
Shear Modulus22 GPa
Young Modulus56 GPa
Poisson Ratio0.26
Speed of Sound2620 m/s
Thermal Conductivity11 W/(m K)
Thermal Expansion0.0000103 K-1

Reactivity
Valence3
ElectronegativityN/A
ElectronAffinity50 kJ/mol
Ionization Energies
565.8, 1110, 2114, 3839 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockf
GroupN/A
Period6
Electron Configuration[Xe]4f96s2
ColorSilver
Discovery
1843 in Sweden
Gas phaseN/A
CAS NumberCAS7440-27-9

Electrical properties
Electrical TypeConductor
Electrical Conductivity8.3×105 S/m
Resistivity1.2×10-6 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie Point222 K
Mass Magnetic Susceptibility0.0000136
Molar Magnetic Susceptibility2.161385×10-6
Volume Magnetic Susceptibility0.1117784

Abundances
% in Universe5×10-8%
% in Sun1×10-8%
% in Meteorites3.9×10-6%
% in Earth's Crust0.000093%
% in Oceans1.4×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius225 pm
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
360.1, 360.1, 569.36 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
159Tb
Isotopic Abundances
159Tb100%

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