Template:Infobox tellurium

Tellurium,  52Te
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General properties
PronunciationTemplate:Infobox element/pronunciation
Appearancesilvery lustrous gray (crystalline),
brown-black powder (amorphous)
Standard atomic weight (Ar, standard)Template:Infobox element/standard atomic weight
Mass numberTemplate:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Tellurium in the periodic table
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Atomic number (Z)52
GroupTemplate:Infobox element/group
Periodperiod 5
Blockp-block
Element categoryTemplate:Infobox element/category format
Electron configuration[Kr] 4d10 5s2 5p4
Electrons per shell
2, 8, 18, 18, 6
Physical properties
Phase at STPsolid
Melting point722.66 K ​(449.51 °C, ​841.12 °F)
Boiling point1261 K ​(988 °C, ​1810 °F)
Density (near r.t.)6.24 g/cm3
when liquid (at m.p.)5.70 g/cm3
Heat of fusion17.49 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]114.1 kJ/mol
Molar heat capacity25.73 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]]
Atomic properties
Oxidation statesTemplate:Infobox element/symbol-to-oxidation-state
ElectronegativityPauling scale: 2.1
[[Ionization energy|Template:Engvar energies]]
  • 1st: 869.3 kJ/mol
  • 2nd: 1790 kJ/mol
  • 3rd: 2698 kJ/mol
Atomic radiusempirical: 140 pm
Covalent radius138±4 pm
Van der Waals radius206 pm
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Other properties
Crystal structureTemplate:Infobox element/crystal structure
Speed of sound thin rod2610 m/s (at 20 °C)
Thermal expansion18 µm/(m·K)[1] (at r.t.)
Thermal conductivity1.97–3.38 W/(m·K)
Magnetic orderingdiamagnetic[2]
Magnetic susceptibility−39.5·10−6 cm3/mol (298 K)[3]
Young's modulus43 GPa
Shear modulus16 GPa
Bulk modulus65 GPa
Mohs hardness2.25
Brinell hardness180–270 MPa
CAS Number13494-80-9
History
Namingafter Roman Tellus, deity of the Earth
DiscoveryFranz-Joseph Müller von Reichenstein (1782)
First isolationMartin Heinrich Klaproth
Main isotopes of tellurium
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| references

Template:Infobox element/element navigation Template:Template reference list Expression error: Unrecognized word "template".

  1. Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
  2. Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
  3. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.