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52 antimony ← tellurium → iodine
Se
↑
Te
↓
Po
General
Name, Symbol, Number tellurium, Te, 52
Chemical series metalloids
Group, Period, Block 16, 5, p
Appearance silvery lustrous gray
Standard atomic weight 127.60(3)  g·mol−1
Electron configuration [Kr] 5s2 4d10 5p4
Electrons per shell 2, 8, 18, 18, 6
Physical properties
Phase solid
Density (near r.t.) 6. Antimony (IPA (Received Pronunciation, /ˈæntɪmoʊni/ (US is a Chemical element with the symbol Sb (stibium meaning "mark" and Iodine (ˈaɪədaɪn ˈaɪədɪn or /ˈaɪədiːn/ from ιώδης iodes "violet" is a Chemical element that has the symbol I and Atomic Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Polonium (pəˈloʊniəm is a Chemical element with the symbol Po and Atomic number 84 discovered in 1898 by Marie and Pierre Curie This is a typical display of the periodic table of the elements and contains the symbol and Atomic number of each element Wikipedia talkFeatured lists for an explanation of this and other inclusion tags below -->This is a list of Chemical elements, sorted by name Wikipedia talkFeatured lists for an explanation of this and other inclusion tags below -->This is a list of chemical elements by symbol, including the A table of Chemical elements ordered by Atomic number and color coded according to type of element In Chemistry a group, also known as a family, is a vertical column in the Periodic table of the Chemical elements There are 18 groups in Metalloid is a term used in Chemistry when classifying the Chemical elements On the basis of their general physical and chemical properties nearly every element In Chemistry a group, also known as a family, is a vertical column in the Periodic table of the Chemical elements There are 18 groups in In the Periodic table of the elements, a period is a horizontal row of the table A block of the Periodic table of elements is a set of adjacent groups The respective highest-energy electrons in each element in a block belong to the same Atomic See also Gold chalcogenides Periodic table A period 5 element is one of the Chemical elements in the fifth row (or period) of the periodic table of the elements. See also Electron configuration The atomic mass (ma is the Mass of an atom most often expressed in unified atomic mass units The atomic mass may be considered to be the total mass To help compare different orders of magnitude, the following list describes various Mass levels between 10&minus36&thinsp kg and 1053&thinspkg In Atomic physics and Quantum chemistry, electron configuration is the arrangement of Electrons in an Atom, Molecule, or other Krypton (ˈkrɪptən or /ˈkrɪptɒn/ from kryptos "hidden" is a Chemical element with the symbol Kr and Atomic number 36 The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J An electron shell may be crudely thought of as an Orbit followed by Electrons around an Atom nucleus. In the Physical sciences a phase is a Set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different Room temperature (also referred to as ambient temperature) is a common term to denote a certain Temperature within enclosed space at which humans are accustomed 24  g·cm−3
Liquid density at m.p. 5. The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different The melting point of a solid is the temperature range at which it changes state from solid to Liquid. 70  g·cm−3
Melting point 722. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. 66 K
(449. The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic 51 °C, 841. The Celsius Temperature scale was previously known as the centigrade scale. 12 °F)
Boiling point 1261 K
(988 °C, 1810 °F)
Heat of fusion 17. Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736 a German Physicist who proposed it in 1724 The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid The kelvin (symbol K) is a unit increment of Temperature and is one of the seven SI base units The Kelvin scale is a thermodynamic The Celsius Temperature scale was previously known as the centigrade scale. Fahrenheit is a temperature scale named after Daniel Gabriel Fahrenheit (1686–1736 a German Physicist who proposed it in 1724 The standard Enthalpy of fusion (symbol \Delta{}H_{fus} also known as the heat of fusion or specific melting heat, is the amount of 49  kJ·mol−1
Heat of vaporization 114. The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material The enthalpy of vaporization, (symbol \Delta{}_{v}H also known as the heat of vaporization or heat of evaporation, is the Energy required 1  kJ·mol−1
Specific heat capacity (25 °C) 25. The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material Specific heat capacity, also known simply as specific heat, is the measure of the heat energy required to increase the Temperature of a unit quantity 73  J·mol−1·K−1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K)     (775) (888) 1042 1266
Atomic properties
Crystal structure hexagonal
Oxidation states ±2, 4, 6
(mildly acidic oxide)
Electronegativity 2. Vapor pressure (also known as equilibrium vapor pressure or saturation vapor pressure) is the Pressure of a Vapor in equilibrium In Mineralogy and Crystallography, a crystal structure is a unique arrangement of Atoms in a Crystal. In Chemistry, the oxidation state is an indicator of the degree of Oxidation of an Atom in a Chemical compound. In Computer science, ACID ( Atomicity Consistency Isolation Durability) is a set of properties that guarantee that Database transactions are " Electronegativity " is the opposite of " Electropositivity," which describes an element's ability to donate electrons 1 (Pauling scale)
Ionization energies
(more)		 1st:  869. The ionization potential, ionization energy or EI of an Atom or Molecule is the Energy required to remove an Electron These tables list the Ionization energy in kJ/mol necessary to remove one mole of Electrons from one mole of neutral gaseous Atoms (first energy respectively 3  kJ·mol−1
2nd:  1790  kJ·mol−1
3rd:  2698  kJ·mol−1
Atomic radius 140  pm
Atomic radius (calc. The joule per mole (symbol J·mol-1 is an SI derived unit of energy per amount of material Atomic radius, and more generally the size of an atom, is not a precisely defined Physical quantity, nor is it constant in all circumstances A picometre ( American spelling: picometer, symbol pm) is a unit of Length in the Metric system, equal to one trillionth ) 123  pm
Covalent radius 135  pm
Van der Waals radius 206 pm
Miscellaneous
Magnetic ordering nonmagnetic
Thermal conductivity (300 K)
(1. The covalent radius, r cov is a measure of the size of Atom which forms part of a Covalent bond. Van der Waals Volume The van der Waals volume, V, also called the atomic volume or molecular volume, is the atomic property most directly In Physics, magnetism is one of the Phenomena by which Materials exert attractive or repulsive Forces on other Materials. In Physics, thermal conductivity, k is the property of a material that indicates its ability to conduct Heat. 97–3. 38)  W·m−1·K−1
Speed of sound (thin rod) (20 °C) 2610 m/s
Young's modulus 43  GPa
Shear modulus 16  GPa
Bulk modulus 65  GPa
Mohs hardness 2. Sound is a vibration that travels through an elastic medium as a Wave. In Solid mechanics, Young's modulus (E is a measure of the Stiffness of an isotropic elastic material In Materials science, shear modulus or modulus of rigidity, denoted by G, or sometimes S or μ, is defined as the ratio of Shear The Mohs scale of mineral hardness characterizes the scratch resistance of various Minerals through the ability of a harder material to scratch a softer material 25
Brinell hardness 180  MPa
CAS registry number 13494-80-9
Selected isotopes
Main article: Isotopes of tellurium
iso NA half-life DM DE (MeV) DP
120Te 0. The Brinell scale characterizes the indentation Hardness of materials through the scale of penetration of an indenter loaded on a material test-piece CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to There are 30 known Isotopes of Tellurium ( Te) with Atomic masses that range from 108 to 137 Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides In Chemistry, natural abundance (NA refers to the abundance Isotopes of a Chemical element as naturally found on a planet Half-Life (computer-game page here It's already listed in the disambiguation page Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. The decay energy is the Energy released by a Nuclear decay. The energy difference of the Reactants is often written as Q: where Q In Nuclear physics, a decay product, also known as a daughter product, daughter isotope or daughter nuclide, is a Nuclide 09% >2. 2×1016y ε ε 1. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun Double electron capture is a Decay mode of Atomic nucleus. For a nuclide ( A, Z) with number of Nucleons A and Atomic 701 120Sn
121Te syn 16. Tin is a Chemical element with the symbol Sn (stannum and Atomic number 50 A synthetic radioisotope is a Radionuclide that is not found in nature no natural process or mechanism exists which produces it or it is so unstable that it decays away in 78 d ε 1. A day (symbol d is a unit of Time equivalent to 24 Hours and the duration of a single Rotation of planet Earth with respect to the Electron capture (sometimes called inverse beta decay) is a Decay mode for Isotopes that will occur when there are too many Protons in the 040 121Sb
122Te 2. Antimony (IPA (Received Pronunciation, /ˈæntɪmoʊni/ (US is a Chemical element with the symbol Sb (stibium meaning "mark" and 55% 122Te is stable with 70 neutrons
123Te 0. Stable isotopes are chemical isotopes that are not Radioactive (to current knowledge This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. 89% >1. 0×1013 y ε 0. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun Electron capture (sometimes called inverse beta decay) is a Decay mode for Isotopes that will occur when there are too many Protons in the 051 123Sb
124Te 4. Antimony (IPA (Received Pronunciation, /ˈæntɪmoʊni/ (US is a Chemical element with the symbol Sb (stibium meaning "mark" and 74% 124Te is stable with 72 neutrons
125Te 7. Stable isotopes are chemical isotopes that are not Radioactive (to current knowledge This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. 07% 125Te is stable with 73 neutrons
126Te 18. Stable isotopes are chemical isotopes that are not Radioactive (to current knowledge This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. 84% 126Te is stable with 74 neutrons
127Te syn 9. Stable isotopes are chemical isotopes that are not Radioactive (to current knowledge This article is a discussion of neutrons in general For the specific case of a neutron found outside the nucleus see Free neutron. A synthetic radioisotope is a Radionuclide that is not found in nature no natural process or mechanism exists which produces it or it is so unstable that it decays away in 35 h β- 0. The hour (symbol h) is a unit of Time. It is not an SI unit but is accepted for use with the SI In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted 698 127I
128Te 31. Iodine (ˈaɪədaɪn ˈaɪədɪn or /ˈaɪədiːn/ from ιώδης iodes "violet" is a Chemical element that has the symbol I and Atomic 74% 2. 2×1024 y β−β− 0. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun In the process of Beta decay, unstable nuclei decay by converting a Neutron in the nucleus to a Proton and emitting an Electron and an electron 867 128Xe
129Te syn 69. Xenon (ˈzɛnɒn or) is a Chemical element represented by the symbol Xe. A synthetic radioisotope is a Radionuclide that is not found in nature no natural process or mechanism exists which produces it or it is so unstable that it decays away in 6 min β- 1. A minute is a Unit of measurement of Time or of Angle. The minute is a unit of Time equal to 1/60th of an Hour or 60 In Nuclear physics, beta decay is a type of Radioactive decay in which a Beta particle (an Electron or a Positron) is emitted 498 129I
130Te 34. Iodine (ˈaɪədaɪn ˈaɪədɪn or /ˈaɪədiːn/ from ιώδης iodes "violet" is a Chemical element that has the symbol I and Atomic 08% 7. 9×1020 y β−β− 2. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun In the process of Beta decay, unstable nuclei decay by converting a Neutron in the nucleus to a Proton and emitting an Electron and an electron 528 130Xe
References

Tellurium (pronounced /tɪˈlʊəriəm/, /tɛl-/) is a chemical element that has the symbol Te and atomic number 52. Xenon (ˈzɛnɒn or) is a Chemical element represented by the symbol Xe. Recommended values for many properties of the elements together with various references are collected on these data pages A chemical element is a type of Atom that is distinguished by its Atomic number; that is by the number of Protons in its nucleus. See also List of elements by atomic number In Chemistry and Physics, the atomic number (also known as the proton A brittle silver-white metalloid which looks like tin, tellurium is chemically related to selenium and sulfur. Metalloid is a term used in Chemistry when classifying the Chemical elements On the basis of their general physical and chemical properties nearly every element Tin is a Chemical element with the symbol Sn (stannum and Atomic number 50 Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Tellurium is primarily used in alloys and as a semiconductor. An alloy is a Solid solution or Homogeneous mixture of two or more elements, at least one of which is a Metal, which itself has A semiconductor' is a Solid material that has Electrical conductivity in between a conductor and an insulator; it can vary over that

Contents

Notable characteristics

Tellurium is extremely rare, one of the nine rarest elements on earth. See also Abundances of the elements (data page The abundance of a Chemical element measures how relatively common the element is or how much of the element It is in the same chemical family as oxygen, sulfur, selenium, and polonium (the chalcogens). Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Polonium (pəˈloʊniəm is a Chemical element with the symbol Po and Atomic number 84 discovered in 1898 by Marie and Pierre Curie See also Gold chalcogenides Periodic table

When crystalline, tellurium is silvery-white and when it is in its pure state it has a metallic luster. In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating This is a brittle and easily pulverized metalloid. Amorphous tellurium is found by precipitating it from a solution of tellurous or telluric acid (Te(OH)6). In Computer science, ACID ( Atomicity Consistency Isolation Durability) is a set of properties that guarantee that Database transactions are However, there is some debate whether this form is really amorphous or made of minute crystals.

Applications

Tellurium is a p-type semiconductor that shows a greater conductivity in certain directions which depends on atomic alignment. A semiconductor' is a Solid material that has Electrical conductivity in between a conductor and an insulator; it can vary over that History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny Chemically related to selenium and sulfur, the conductivity of this element increases slightly when exposed to light (photoelectric effect). Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Introduction When a Metallic surface is exposed to Electromagnetic radiation above a certain threshold Frequency, the light is absorbed and Electrons

It can be doped with copper, gold, silver, tin, or other metals. Copper (ˈkɒpɚ is a Chemical element with the symbol Cu (cuprum and Atomic number 29 Gold (ˈɡoʊld is a Chemical element with the symbol Au (from its Latin name aurum) and Atomic number 79 Silver (ˈsɪlvɚ is a Chemical element with the symbol " Ag " (argentum from the Ancient Greek: ἀργήντος - argēntos gen Tin is a Chemical element with the symbol Sn (stannum and Atomic number 50 When in its molten state, tellurium is corrosive to copper, iron, and stainless steel. Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 In Metallurgy, stainless steel is defined as a Steel Alloy with a minimum of 11

Tellurium gives a greenish-blue flame when burned in normal air and forms tellurium dioxide as a result. Tellurium dioxide (TeO2 is a solid Oxide of Tellurium. It is encountered in two different forms the yellow orthorhombic mineral Tellurite,β-TeO2

Metal alloys

Other uses:

High purity metalorganics of both selenium and tellurium are used in the semiconductor industry, and are prepared by adduct purification. Metalorganics, (abbr MO) also known as Organometallics, metallo-organics', or organo-inorganics, are used extensively in Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Adduct purification is a technique for preparing extremely pure simple Organometallic compounds which are generally unstable and hard to handle by purifying a stable Adduct [1][2]

Semiconductor and electronic industry uses:

History

Tellurium (Latin tellus meaning "earth") was discovered in 1782 by the Hungarian Franz-Joseph Müller von Reichenstein (Müller Ferenc) in Nagyszeben (now, Sibiu) Transylvania. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. Franz-Joseph Müller Freiherr von Reichenstein or Franz-Joseph Müller von Reichenstein (Müller F Sibiu (si'biw Hermannstadt Nagyszeben Сибињ/Sibinj הערמאנשטאדט ( Hermanshtadt) or סזעבען ( Szeben)) is one of the largest cities in Transylvania (Ardeal or ro ''Transilvania'' Erdély, see also other denominations) is a Central European region located in the eastern half of the Carpathian In 1789, another Hungarian scientist, Pál Kitaibel, also discovered the element independently, but later he gave the credit to Müller. In 1798, it was named by Martin Heinrich Klaproth who earlier isolated it. Martin Heinrich Klaproth ( 1 December 1743 – 1 January 1817) was a German Chemist.

Tellurium was used as a chemical bonder in the making of the outer shell of the first atom bomb. The 1960s brought growth in thermoelectric applications for tellurium, as well as its use in free-machining steel, which became the dominant use. Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0

Occurrence

With an abundance in the Earth's crust even lower than platinum, tellurium is, apart from the precious metals, the rarest stable solid element in the earth's crust. In Geology, a crust is the outermost solid shell of a planet or moon Platinum (ˈplætɪnəm is a Chemical element with the Atomic symbol Pt and an Atomic number of 78 Precious Metal is the eighteenth episode in the of the popular American Crime drama, which is set in Las Vegas, Nevada. Its abundance in the Earth's crust is 1 to 5 ppb, compared with 5 to 37 ppb for platinum. "Parts-per" notation is used especially in Science and Engineering, to denote Ratios (relative proportions in measured quantities particularly Platinum (ˈplætɪnəm is a Chemical element with the Atomic symbol Pt and an Atomic number of 78 By comparison, even the rarest of the lanthanides have crustal abundances of 500 ppb. Terminology The Trivial name " Rare earths " is sometimes used to describe all the lanthanoids together with Scandium and Yttrium

The extreme rarity of tellurium in the Earth's crust is not a reflection of its cosmic abundance, which is in fact greater than that of rubidium[1], even though rubidium is ten thousand times more abundant in the Earth's crust. Rubidium (ruːˈbɪdiəm /rəˈbɪdiəm/ is a Chemical element with the symbol Rb and Atomic number 37 Rather, the extraordinarily low abundance of tellurium on Earth results from the fact that, during the formation of the Earth, the stable form of elements in the absence of oxygen and water was controlled by the oxidation and reduction of hydrogen. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Water is a common Chemical substance that is essential for the survival of all known forms of Life. Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 Under this scenario elements such as tellurium which form volatile hydrides were severely depleted during the formation of the Earth's crust through evaporation. Tellurium and selenium are the heavy elements most depleted in the Earth's crust by this process.

Tellurium is sometimes found in its native (elemental) form, but is more often found as the tellurides of gold (calaverite, krennerite, petzite, sylvanite, and others). Gold (ˈɡoʊld is a Chemical element with the symbol Au (from its Latin name aurum) and Atomic number 79 Calaverite, or gold telluride, is an uncommon telluride of Gold; it is a Metallic Mineral. Krennerite is an Orthorhombic Gold telluride Mineral which can contain a relatively small amount of Silver in the structure The mineral petzite, Ag 3 Au[[tellurium Te]]2 is a soft steel-gray Mineral generally deposited by Hydrothermal activity Sylvanite or silver gold telluride, ( Ag, Au) Te 2 is the most common Telluride of Gold. Tellurium compounds are the only chemical compounds of gold found in nature, but tellurium itself (unlike gold) is also found combined with other elements (in metallic salts). The principal source of tellurium is from anode sludges produced during the electrolytic refining of blister copper. An anode is an Electrode through which Electric current flows into a polarized electrical device Copper (ˈkɒpɚ is a Chemical element with the symbol Cu (cuprum and Atomic number 29 It is a component of dusts from blast furnace refining of lead. A blast furnace is a type of metallurgical Furnace used for Smelting to produce metals generally Iron. Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly Treatment of 500 tons of copper ore typically yields one pound of tellurium. Tellurium is produced mainly in the US, Canada, Peru, and Japan. The United States of America —commonly referred to as the Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page Peru (Perú Piruw Piruw officially the Republic of Peru ( reˈpuβlika del peˈɾu is a country in western South America. For a topic outline on this subject see List of basic Japan topics. See here.

Commercial-grade tellurium is usually marketed as minus 200-mesh powder but is also available as slabs, ingots, sticks, or lumps. Mesh material is often used in determining the Particle size distribution of a Granular material. The year-end price for tellurium in 2000 was US$14 per pound. The United States dollar ( sign: $; code: USD) is the unit of Currency of the United States; it has also been In recent years, tellurium price was driven up by increased demand and limited supply, reaching as high as US$100 per pound in 2006. The United States dollar ( sign: $; code: USD) is the unit of Currency of the United States; it has also been See also here.

See also: Telluride, Colorado, category:Telluride minerals
Tellurium crystal
Tellurium crystal

Compounds

Tellurium is in the same series as sulfur and selenium and forms similar compounds. The Town of Telluride is a Home Rule Municipality that is the County seat and the most populous town of San Miguel County in the southwestern Sulfur or sulphur (ˈsʌlfɚ see spelling below) is the Chemical element that has the Atomic number 16 Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 A compound with metal or hydrogen and similar ions is called a telluride. Gold and silver tellurides are considered good ores. Gold (ˈɡoʊld is a Chemical element with the symbol Au (from its Latin name aurum) and Atomic number 79 Silver (ˈsɪlvɚ is a Chemical element with the symbol " Ag " (argentum from the Ancient Greek: ἀργήντος - argēntos gen Compounds with tellurate ions complexes TeO42- or TeO66- are known as tellurates. The tellurate Ion is TeO42&minus or TeO66&minus Unlike sulfate tellurate is a somewhat good oxidizer it can be reduced Also tellurites TeO32-. This article is about the Tellurium compounds For the similarly named Star Trek race see Tellarite. Also tellurols –TeH, named with prefix tellanyl- or suffix -tellurol.

See also: Category:Tellurium compounds

Isotopes

Main article: isotopes of tellurium

There are 30 known isotopes of tellurium with atomic masses that range from 108 to 137. There are 30 known Isotopes of Tellurium ( Te) with Atomic masses that range from 108 to 137 Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides The atomic mass (ma is the Mass of an atom most often expressed in unified atomic mass units The atomic mass may be considered to be the total mass Naturally found tellurium consists of eight isotopes (listed in the table to the right); three of them are observed to be radioactive. 128Te has the longest known half-life, 2. 2×1024 years, among all radioactive isotopes.

Precautions

Tellurium and tellurium compounds should be considered to be mildly toxic and need to be handled with care. Toxicity is the degree to which a substance is able to damage an exposed organism

Acute poisoning is rare. [3] Tellurium is not reported to be carcinogenic. [3]

Humans exposed to as little as 0. 01 mg/m3 or less in air develop "tellurium breath", which has a garlic-like odor. Allium sativum L, commonly known as garlic, is a species in the Onion family Alliaceae. [4] The garlic odor that is associated with human intake of tellurium compounds is caused from the tellurium being metabolized by the body. When the body metabolizes tellurium in any oxidation state, the tellurium gets converted into dimethyl telluride. Dimethyl telluride is an Organotelluride compound formula ( CH3)2 Te, also known by the abbreviation DMTe Dimethyl telluride is volatile and produces the garlic-like smell. Even though the metabolic pathways of tellurium are not known, it is generally assumed that they resemble those of the more extensively studied selenium, because the final methylated metabolic products of the two elements are similar. Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78

References

  1. ^ doi:10.1016/0022-0248(88)90613-6 Journal of Crystal Growth Volume 93, Issues 1-4 , 1988, Pages 744-749
  2. ^ U.S. Patent 5,117,021  Method for purification of tellurium and selenium alkyls
  3. ^ a b Harrison, W; S Bradberry, J Vale (1998-01-28). A digital object identifier ( DOI) is a permanent identifier given to an Electronic document. Year 1998 ( MCMXCVIII) was a Common year starting on Thursday (link will display full 1998 Gregorian calendar) Events 1077 - Walk to Canossa: The Excommunication of Henry IV Holy Roman Emperor is lifted Tellurium (HTML). HTML, an initialism of HyperText Markup Language, is the predominant Markup language for Web pages It provides a means to describe the structure International Programme on Chemical Safety. The International Programme on Chemical Safety ( IPCS) is a collaboration between three United Nations bodies&mdashthe World Health Organization, the Retrieved on 2007-01-12. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 475 - Basiliscus becomes Byzantine Emperor, with a coronation ceremony in the Hebdomon palace in Constantinople
  4. ^ Tellurium (HTML). HTML, an initialism of HyperText Markup Language, is the predominant Markup language for Web pages It provides a means to describe the structure Los Alamos National Laboratory (2003-12-15). Los Alamos National Laboratory (LANL (previously known at various times as Site Y, Los Alamos Laboratory, and Los Alamos Scientific Laboratory) is a Year 2003 ( MMIII) was a Common year starting on Wednesday of the Gregorian calendar. Events 533 - Byzantine general Belisarius defeats the Vandals, commanded by King Gelimer, at the Battle of Retrieved on 2007-01-12. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 475 - Basiliscus becomes Byzantine Emperor, with a coronation ceremony in the Hebdomon palace in Constantinople

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