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Title: Chemistry/Elements/Tellurium - EnvironmentalChemistry.com: Tellurium Atomic structure, chemical and physical properties, and table of nuclides.
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It\'s_Elemental__Tellurium Basic physical and historical information.
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| WebElements__Tellurium Extensive information on history, uses, occurrence, compounds, and properties.
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Periodic Table of Elements: Tellurium – Te (EnvironmentalChemistry.com)
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Periodic Table of ElementsElement Tellurium – TeComprehensive data on the chemical element Tellurium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Tellurium.
Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies.
Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.
Tellurium Menu
Tellurium Page One
Overview of Tellurium
Tellurium's Name in Other Languages
Atomic Structure of Tellurium
Chemical Properties of Tellurium
Physical Properties of Tellurium
Regulatory / Health
Who/When/Where/How
Tellurium Page Two
Nuclides / Isotopes
Potential Parent Nuclides
Tellurium Page Three
Common Chemical Compounds of Tellurium
Overview of Tellurium
Atomic Number:52
Group: 16
Period: 5
Series: Metalloids (Nonmetal)
Tellurium's Name in Other LanguagesLatin: TelluriumCzech: TellurCroatian: TelurijFrench:
TellureGerman: Tellur - rItalian: TellurioNorwegian: TellurPortuguese: Telúrio
Russian:  Spanish: TeluroSwedish:
Tellur
Atomic Structure of Tellurium
Atomic Radius: 1.42Å
Atomic Volume: 20.5cm3/mol
Covalent Radius: 1.36Å
Cross Section (Thermal Neutron Capture)  a/barns: 4.7
Crystal Structure: Hexagonal
Electron Configuration:1s2
2s2p6
3s2p6d10
4s2p6d10
5s2p4
Electrons per Energy Level: 2,8,18,18,6
Shell Model
Ionic Radius: 0.97Å
Filling Orbital: 5p4
Number of Electrons (with no charge): 52
Number of Neutrons (most common/stable nuclide): 76
Number of Protons: 52
Oxidation States: ±2,4,6
Valence Electrons: 5s2p4
Electron Dot Model
Chemical Properties of Tellurium
Electrochemical Equivalent: 1.1902g/amp-hr
Electron Work Function: 4.95eV
Electronegativity: 2.1 (Pauling); 2.01 (Allrod Rochow)
Heat of Fusion: 17.49kJ/mol
Incompatibilities:Oxidizers, chlorine, cadmium
Ionization PotentialFirst: 9.009Second: 18.6Third: 27.96
Valence Electron Potential (-eV): 59
Physical Properties of Tellurium
Atomic Mass Average: 127.6
Boiling Point: 1261K 988°C 1810°F
Coefficient of lineal thermal expansion/K-1: 16.75E-6
ConductivityElectrical: 2.0E-6 106/cm  Thermal: 0.0235
W/cmK
Density: 6.24g/cc @ 300K
Description:Silvery white metal-looking non-metal that is usually obtained as a dark grey powder. It is unaffected by water and HCl, but burns in air or oxygen and dissolves in HNO3.
Elastic Modulus:Bulk: 65/GPaRigidity: 16.7/GPaYoungs: 47.1/GPa
Enthalpy of Atomization: 190.4 kJ/mole @ 25°C
Enthalpy of Fusion: 17.49 kJ/mole
Enthalpy of Vaporization: 50.6 kJ/mole
Flammablity Class: Combustible Solid
Freezing Point: see melting point
Hardness ScaleBrinell: 180 MN m-2Mohs: 2.25
Heat of Vaporization: 52.55kJ/mol
Melting Point: 722.8K 449.65°C 841.37°F
Molar Volume: 20.42 cm3/mole
Optical Reflectivity: 50%Optical Refractive Index: 1.000991
Physical State (at 20°C & 1atm): Solid
Specific Heat: 0.2J/gK
Vapor Pressure = 23.1Pa@449.65°C
Regulatory / Health
CAS Number
13494-80-9
RTECS: WY2625000OSHA Permissible Exposure Limit (PEL)TWA: 0.1 mg/m3
OSHA PEL Vacated 1989TWA: 0.1 mg/m3
NIOSH Recommended Exposure Limit (REL)TWA: 0.1 mg/m3IDLH: 25 mg/m3
Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
Target Organs: Skin, central nervous system, blood
Levels In Humans:Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.Blood/mg dm-3: 0.0055Bone/p.p.m: n/aLiver/p.p.m: 0.014Muscle/p.p.m: 0.017Daily Dietary Intake: 0.6 mgTotal Mass In Avg. 70kg
human: 0.7 mg
Who / Where / When / HowDiscoverer: Baron Franz Müller von ReichensteinDiscovery Location: Sibiu Romania
Discovery Year: 1783Name Origin: Greek: tellus (the Earth).
Abundance of Tellurium:Earth's Crust/p.p.m.: 0.005
Seawater/p.p.m.: Atlantic Suface: 1.6E-07Atlantic Deep: 7E-08Pacific Surface: 1.9E-07Pacific Deep: 1.7E-07
Atmosphere/p.p.m.: N/A
Sun (Relative to H=1E12): N/A
Sources of Tellurium:Obtained as a by-product of copper and lead refining. Annual world production is around 215 tons.
Uses of Tellurium: Used to improve the machining quality of metal products and to color glass and ceramics. Also used in thermoelectric devices, vulcanization of rubber, percussion caps, battery plate protectors and electrical resistors.
Additional Notes:
[Last update: 2/22/2007]Notes below
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Tellurium Menu
Tellurium Page One
Overview of Tellurium
Tellurium's Name in Other Languages
Atomic Structure of Tellurium
Chemical Properties of Tellurium
Physical Properties of Tellurium
Regulatory / Health
Who/When/Where/How
Tellurium Page Two
Nuclides / Isotopes
Potential Parent Nuclides
Tellurium Page Three
Common Chemical Compounds of Tellurium
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This database focuses on the most common chemical compounds used in the home and industry.
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