• Class: Non-Metals
• Period: 5
• IUPAC group: 16
• Traditional: VIb

• Discovered in: 1783 by Baron Franz Joseph Muller
• Origin of name: LaTin: tellus, (earth)
• Historical or alternate name:

Calaverite (telluride of gold) & combined with other metals

Silvery white, metallic appearing solid or dark grey powder. Unreactive with water or HCl; dissolves in HNO3; burns in air or Oxygen.

• Atmosphere: ~0.0 ppm
• Primitive mantle: 0.022 ppm
• Sea water: trace ppm
• Metallic meteorite: 2.280 ppm
• ConTinental crust: 0.01 ppm
• Solar photosphere: ~0.0 log of abundance
• Oceanic crust: 0.003 ppm
• Solar system: 4.91 relative to Si=1.0e6

   Hazards

Poison. Moderate toxicity by inhalation or ingestion..

• Lower:0.01
• Upper:1.0

Tellurium Physical Properties

 Transitional Data

• State: Solid
• Density: 6.25 g/cm3

 Molar enthalpy

• Atomization: kJ mol-1
• Fusion: 13.5 kJ mol-1
• Vaporization: 104.6 kJ mol-1

 Transition points

• MelTing point: 722.7 K
• Boiling point: 1263.0 K
• Critical temperature: 2329.0 K

 Molar properties

• Atomic weight: 127.60 g/mole
• Molar volume: 20.584 cm3 mol-1

 Crystal structure sequence

complex-trigonal

 Thermodynamics

• State: solid
  • Enthalpy 0
  • Gibbs function 0
  • Entropy 49.71
  • Heat Capacity 25.73

• State: gas
  • Enthalpy 193.73
  • Gibbs function 157.08
  • Entropy 182.74
  • Heat Capacity 20.786

 Miscellaneous physical

• Electrical resistivity: 4.36 E5 µ-ohms/cm
• Debye temperature: 153.0 K
• Thermal conductivity: 2.35 W / m / K
• Coefficient of linear expansion: 18.8Coef. per K
• Mass magnetic susceptibility: -3.9e-9
• X-ray diffraction mass absorption coefficients:
• CuK: 282 (µ/p)/cm2 g-1
• MoK: 35.0 (µ/p)/cm2 g-1

Tellurium Chemical Properties

 Chemical basics:

• Oxidation states: -2 +4 +6
• Molecular wt: 127.60 g/mole

 Radii

• Covalent: 137 pm
• Atomic: 137.0 pm
• Van der Waals: 220 pm

 Ions:

• ion: -2 pm 221.0
• ion: +4 pm 97.0
• ion: +6 pm 56.0

 Covalent bonds

 Effective nuclear charge

• Slater: 6.95
• Clementi: 10.81
• Froese-Fischer: 13.51

 Electronegativity

• Pauling: 2.1
• Allred-Rochow: 2.01

 Standard reactions

Tellurium Nuclear Properties

• Known 29
• Listed 10

• Known 115 - 135
• Listed 118 - 130

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 6.0 days
  • Decay mode: E.C.,
  • Source: reactor
• Notes

• % Occ.:Natural 0.096%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 16.8 days
  • Decay mode: E.C.,
  • Source: reactor
• Notes

• % Occ.:Natural 2.600%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 0.908%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 1/2
• Radioisotopes:
  • Half-life: 1.2 E13 years
  • Decay mode: E.C.,
  • Source: reactor
• Notes

• % Occ.:Natural 4.816%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 7.140%
• Mossbauer NRA: 5.69
• Nuclear spin/Quantum no.: 1/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 18.950%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 31.690%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 1.5 E24 years
  • Decay mode: Beta-Beta-
  • Source: reactor
• Notes

• % Occ.:Natural 33.800%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 2.0 E21 years
  • Decay mode: Beta-Beta-
  • Source: reactor
• Notes

• Isotope Cross-section 4.7±0.1 barns

• Absolute sensitivity: 1.56e-4 1H=1.0
• Relative sensitivity: 1.80e-2 1H=1.0
• Receptivity: 0.89 13C=1.0
• Magnetogyric ratio: -7.0006e7 rad / T / s
• Quadropole moment: m2
• Frequency: 26.207 MHz
• Reference: Te(CH3)2

Tellurium Energy Properties

Electrons

• Ground state electron configuration: [Kr] 4d10 5s2 5p4
• Electron affinity: 190.2 kJ mol-1
• Filling orbitals:

Spectral lines

 Ionization energies

 Atomic energy levels