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Technical data for Tellurium

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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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion17.5 kJ/mol
Heat of Vaporization48 kJ/mol
Heat of CombustionN/A
Specific Heat201 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
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
Vickers HardnessN/A
Bulk Modulus65 GPa
Shear Modulus16 GPa
Young Modulus43 GPa
Poisson RatioN/A
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
Heat of CombustionN/A
DOT Hazard Class6.1
DOT Numbers2811
EU NumberN/A
NFPA Fire Rating0
NFPA HazardsN/A
NFPA Health Rating2
NFPA Reactivity Rating0
RTECS NumberRTECSWY2625000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockp
Group16
Period5
Electron Configuration[Kr]4d105s25p4
ColorSilver
Discovery
1783 in Romania
Gas phaseN/A
CAS NumberCAS13494-80-9
CID NumberCID6327182
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSWY2625000

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

Magnetic properties
Magnetic TypeDiamagnetic
Curie PointN/A
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
Decay ModeN/A
Quantum Numbers3P2
Neutron Cross Section5.4
Neutron Mass Absorption0.0013
Known Isotopes
105Te, 106Te, 107Te, 108Te, 109Te, 110Te, 111Te, 112Te, 113Te, 114Te, 115Te, 116Te, 117Te, 118Te, 119Te, 120Te, 121Te, 122Te, 123Te, 124Te, 125Te, 126Te, 127Te, 128Te, 129Te, 130Te, 131Te, 132Te, 133Te, 134Te, 135Te, 136Te, 137Te, 138Te, 139Te, 140Te, 141Te, 142Te
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.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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