Technical data for Tellurium

Overview
NameTellurium
SymbolTe
Atomic Number52
Atomic Weight127.6
Density6.24 g/cm3
Melting Point449.51 °C
Boiling Point988 °C

Thermal properties
PhaseSolid
Melting Point449.51 °C
Boiling Point988 °C
Absolute Melting Point722.66 K
Absolute Boiling Point1261 K
Heat of Fusion17.5 kJ/mol
Heat of Vaporization48 kJ/mol
Heat of CombustionN/A
Specific Heat201 J/(kg K)[note]
Thermal Conductivity3 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density6.24 g/cm3
Density (Liquid)5.7 g/cm3
Molar Volume0.000020449
Brinell Hardness180 MPa
Mohs Hardness2.25 MPa
Bulk Modulus65 GPa
Shear Modulus16 GPa
Young Modulus43 GPa
Refractive Index1.000991
Speed of Sound2610 m/s
Thermal Conductivity3 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence6
Electronegativity2.1
ElectronAffinity190.2 kJ/mol
Ionization Energies
869.3, 1790, 2698, 3610, 5668, 6820, 1.32×104 kJ/mol

Health and Safety
Autoignition Point340 °C
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockp
Group16
Period5
Electron Configuration[Kr]4d105s25p4
ColorSilver
Discovery
1783 in Romania
Gas phaseN/A
CAS NumberCAS13494-80-9

Electrical properties
Electrical TypeSemiconductor
Electrical Conductivity1×104 S/m
Resistivity0.0001 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeDiamagnetic
Mass Magnetic Susceptibility-3.9×10-9
Molar Magnetic Susceptibility-4.98×10-10
Volume Magnetic Susceptibility-0.0000243

Abundances
% in Universe9×10-7%
% in SunN/A
% in Meteorites0.00021%
% in Earth's Crust9.9×10-8%
% in OceansN/A
% in HumansN/A

Atomic dimensions and structure
Atomic Radius123 pm
Covalent Radius135 pm
Van der Waals Radius206 pm
Crystal StructureSimple Trigonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
445.72, 445.72, 592.9 pm
Space Group NameP3121
Space Group Number152

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
120Te, 122Te, 124Te, 125Te, 126Te
Isotopic Abundances
120Te0.09%
122Te2.55%
123Te0.89%
124Te4.74%
125Te7.07%
126Te18.84%
128Te31.74%
130Te34.08%

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