Copyright © Philip M. Parker, INSEAD. Terms of Use.
Definition: Tc |
TcNoun1. A crystalline metallic element not found in nature; occurs as one of the fission products of uranium. 2. A permanent council of the United Nations that commissions a country (or countries) to undertake the administration of a territory. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
| Domain | Definition |
Computing | Tc |
Slang | Adjective. Source: "TC" is a short phrase that came for the words "too cool". Definition: Too cool for one or others. Context: The phrase is used by the AKA's in casual conversation. Social Source: AKA'S (Aoistair, Kenny, and Amon) . Source: Compiled by The University of Oregon. (additional references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
List of people by name: A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z Ta-Tb - Tc-Td - Te - Tf-Th - Ti - Tj - Tk-Tn - To - Tp-Tr - Ts-Tt - Tu - Tv - Tw-Tx - Ty - TzTc
- Tchaikovsky, Bram, musician
- Tchaikovsky, Pyotr Ilyich, (1840-1893), Russian
- Tcherepnin, Alexander, (born 1899), composer
Td
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "List of people by name: Tc-Td."
(From Wikipedia, the free Encyclopedia)
Technetium is a chemical element in the periodic table that has the symbol Tc and atomic number 43. A silvery gray, radioactive, crystalline transition metal that is not found in nature, technetium occurs as one of the fission products of uranium and is used in bone imaging and corrosion protection. Chemical properties of this element are intermediate between rhenium and manganese.
General Name, Symbol, Number Technetium, Tc, 43 Chemical series Transition metals Group, Period, Block 7, 5 , d Density, Hardness 11500 kg/m3, NA Appearance Silvery gray metallic Atomic Properties Atomic weight [98] amu Atomic radius (calc.) 135 (183) pm Covalent radius 156 pm van der Waals radius no data Electron configuration [Kr]4d4d6 5s1 e- 's per energy level 2, 8, 18, 14, 1 Oxidation state (Oxide) 7 (strong acid) Crystal structure Hexagonal Physical Properties State of matter Solid (__) Melting point 2430 K (3915 °F) Boiling point 4538 K (7709 °F) Molar volume 8.63 ×1010-3 m3/mol Heat of vaporization 660 kJ/mol Heat of fusion 24 kJ/mol Vapor pressure 0.0229 Pa at 2473 K Speed of sound no data Miscellaneous Electronegativity 1.9 (Pauling scale) Electron Affinity -53 kJ/mol) First Ionization Energy 720 kJ/mol Specific heat capacity 210 J/(kg*K) Electrical conductivity 6.7 106/m ohm Thermal conductivity 50.6 W/(m*K) 1st ionization potential 702 kJ/mol 2nd ionization potential 1470 kJ/mol 3rd ionization potential 2850 kJ/mol Most Stable Isotopes
iso NA half-life DM DE MeV DP 97Tc {syn.} 2.6 E6 y &epsilon 0.320 97Mo 98Tc {syn.} 4.2 E6 y β- 1.796 98Ru 99Tc {syn.} 211,100 y β- 0.294 99Ru SI units & STP are used except where noted.
Notable Characteristics
Technetium is a silvery-gray metal that slowly tarnishes in moist air. Under oxidizing conditions technetium (VII) will exist as the pertechnetate ion, TcO4-. The chemistry of technetium is intermediate between rhenium and manganese. Technetium dissolves in aqua regia, nitric acid, and concentrated sulfuric acid, but it is not soluble in hydrochloric acid. This element is a very good corrosion inhibitor for steel and the metal is an excellent superconductor at temperatures below 11 K.This element is unusual because it has no stable isotopes and is therefore extremely rare on earth. Common oxidation states of technetium include +2, +4, +5, +6 and +7.
Applications
Technetium is one of the most powerful known preventatives of rust, and is also a valuable source of beta rays. Ammonium pertechnate (NH4TcO4), is a specialized corrosion preventer for steel. Five parts per million of KTcOTcO4 in aerated distilled water protects mild carbon steel at temperatures up to 250 °C. This protection is limited to closed systems due to the radioactive nature of technetium. Other uses;
- Tcm-95 ("m" stands for meta state) with a half-life of 61 days is used in radioactive tracer studies.
- Tcm-99 (half-life 6.01 hours) is used in many radioactive isotope medical tests due to its short half-life, the gamma ray energy it emits, and its ability to chemically bind to many active biomolecules.
- Organic technetium compounds are used in bone imaging.
- Technetium is an excellent superconductor at tempuratures of 11 degrees kelvin and below.
- Technetium is commercially available to holders of O.R.N.L. permits at a price of $60/g.
History
Technetium (Greek technetos meaning "artificial") was discovered by Carlo Perrier and Emilio Segré in Italy in 1937. The researchers found it in a sample of molybdenum sent to them by Ernest Lawrence. The sample was bombarded by deuterium nuclei in the University of California, Berkeley cyclotron which gave them the isotope Tc-97. Technetium was the first element to be artificially produced.For a number of years there was a gap in the periodic table at element 43. Dmitri Mendeleev predicted that this missing element would be chemically similar to manganese and gave it the name ekamanganese. In 1925 element 43 was erroneously reported as discovered and was given the name masurium. The development of nuclear energy in the mid 20th century generated the first known samples of element 43 by nuclear reactions.
Occurrence
Once it was available in macroscopic quantities i.e. enough to determine its chemical and physical properties, it was discovered to exist naturally elsewhere in the universe. Some red giant stars (S-, M-, and N-types) contain an emission line in their spectrum corresponding to the presence of technetium. Its presence in red giants has led to the establishment of new theories about the production of heavy elements in stars.Since its discovery, there have been many searches in terrestrial materials for natural sources. In 1962, technetium-99 was isolated and identified in pitchblende from Africa in very small quantities as a spontaneous fission product of uranium-238. This discovery was made by B.T. Kenna and P.K. Kuroda.
Tc-99 is produced as a byproduct from the fission of uranium in nuclear reactors and it is prepared by chemically separating it from reactor waste.
Isotopes
Technetium is one of two elements in the first 83 that have no stable isotopes (the other element is promethium). The most stable radioisotopes are Tc-98 with a half-life of 4.2 million years, Tc-97 (half-life: 2.6 million years) and Tc-99 (half-life: 211,100 years).Twenty-two other radioisotopes have been characterized with atomic weights ranging from 87.933 amu (Tc-88) to 112.931 amu (Tc-113). Most of these have half-lives that are less than an hour except Tc-93 (2.75 hours), Tc-94 (293 minutes), Tc-95 (20 hours), and Tc-96 (4.28 days). There are also numerous meta states with Tcm-97 being the most stable with a half-life of 90.1 days (0.097 MeV). This is followed by Tcm-95 (half life: 61 days, 0.038 MeV), and Tcm-99 (half-life: 6.01 hours, 0.143 MeV).
The primary decay mode before the most stable isotope, Tc-98, is electron capture and the primary mode after is beta emission with one instance of election capture during the first mode of the two mode decay of Tc-100. The primary decay product before Tc-98 is molybdenum and the primary product after is ruthenium (the product of the first decay mode of Tc-100 is Mo, however).
Precautions
Compounds containing this element are encountered extremely rarely by most people and is for practical purposes not found in nature. Tc-99 is a contamination hazard and should be handled in a glove box. All isotopes of technetium are highly radioactive and are thus very toxic. Technetium has no natural biological role.
External Links
- WebElements.com - Technetium
- EnvironmentalChemistry.com - Technetium
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Technetium."
| The following table is compiled from various sources, across various languages. When English abbreviations or acronyms come from a non-English source, this is noted. | |||
| Entry | Source | Expression | Field |
TC | English | Tax Court | N/A |
Tc | French | Technétium | Chemistry |
TC | German | Tetracyclin | Medicine |
TC | Greek | ικανότητες συναλλαγής | Computing |
TC | Italian | Tomografia computerizzata | N/A |
Tc | Spanish | Tiempo de confirmación | Post & Telecom |
| TC 10 | Dutch | Kennisgeving van doorgang | European Union, Finance |
| TC 10 | English | Transit advice note | European Union, Finance |
| TC 10 | French | Avis de passage | European Union, Finance |
| TC 10 | Italian | Avviso di passaggio | European Union, Finance |
Source: compiled by the editor, based on several corpora (additional references). | |||
Synonyms: TcSynonyms: atomic number 43 (n), technetium (n). (additional references) |
Crosswords: Tc |
| Specialty definitions using "Tc": confirmation time ♦ DNA Transposable Elements ♦ Homer a Cure for the Ague. (references) |
| Domain | Usage | |
Movie/TV Titles | Fan TC (1994) TC 2000 (1993) | |
Source: compiled by the editor from various references; see credits. | ||
| Domain | Title | ||
References | |||
Books |
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High Tech |
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Source: compiled by the editor from various references; see credits. | |||
| Thumbnail | Description & Credit |  | The Lighthouse at Triagoz. Plate 27, Figure 1. Shows high and low water. In: 'Memoir upon the Lighting, Beaconage, and Buoyage of the Coast of France" by M. Leonce Reynaud. Plates. Translated by Rear Admiral Thornton A. Jenkins, U. S. N. 1871. Washington. Call Number TC 375 .R45 1871. Credit: Treasures of the Library. |
Source: pictures compiled by the editor from various references; see picture credits. | |||
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| "Terrycloth Frogs" by Ryan Glanzer Commentary: "The TC Frogs hang out while waiting to be won at Valleyfair's Skatterball." |
Source: photographs selected by the editor, with permission from the photographers. |
| Subject | Topic | Quote |
Health | White TC, Marr KA, Bowden R. Clinical, cellular and molecular factors that contribute to antifungal drug resistance. (references) | |
The TC model has been studied extensively and can be quite effective in reducing drug use and recidivism to criminal behavior. (references) | ||
Compared with patients in other forms of drug treatment, the typical TC resident has more severe problems, with more co-occurring mental health problems and more criminal involvement. (references) | ||
Economic History | Ecuador | There are 5 national TV networks: Ecuavisa, Teleamazonas, Gamavision, Telesistema and TC Television; 4 cable television networks: Direct TV, Univisa, TV Cable, Cablevision which show programs from the U.S. and Europe, and a number of local stations in the larger cities. (references) |
Political Economy | Ecuador | In addition, efforts are being made to restructure the electoral commissions and appointments in the TC. (references) |
Ecuador | At present, given that 2001 is the pre-electoral year, it appears that political parties and forces in Congress, the TSE and the TC are endeavoring to align themselves strategically in preparation for the election. (references) | |
Source: compiled by the editor from ICON Group International, Inc.; see credits. | ||
| "Tc" is generally used as a noun (proper) -- approximately 90.23% of the time. "Tc" is used about 174 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted) |
| Parts of Speech | Percent | Usage per 100 Million Words | Rank in English |
| Noun (proper) | 90.23% | 157 | 25,059 |
| Noun (common) | 6.9% | 12 | 101,599 |
| Noun (singular) | 2.87% | 5 | 157,705 |
| Total | 100.00% | 174 | N/A |
Source: compiled by the editor from several corpora; see credits.
| Country | Name |
| Italy | TC Sistema SpA |
| (more examples...) |
Source: compiled by the editor from Icon Group International, Inc.
Expressions using "Tc": Sodium Pertechnetate Tc 99m ♦ TC sublayer ♦ Technetium Tc 99m Aggregated Albumin ♦ technetium Tc 99m dextran ♦ Technetium Tc 99m Diethyl-iminodiacetic Acid ♦ Technetium Tc 99m Dimercaptosuccinic Acid ♦ Technetium Tc 99m Disofenin ♦ Technetium Tc 99m Exametazime ♦ Technetium Tc 99m Lidofenin ♦ Technetium Tc 99m Medronate ♦ Technetium Tc 99m Mertiatide ♦ Technetium Tc 99m Pentetate ♦ Technetium Tc 99m Pyrophosphate ♦ Technetium Tc 99m Sestamibi ♦ technetium Tc 99m sulfur colloid. Additional references. | |
| Hyphenated Usage | |
Beginning with "Tc": tc-cultured, tc-dtpa, Tc-ec, tc-fresh, Tc-hmpao, tc-ldiethylene, tc-sulphur, tc-treated. | |
Ending with "Tc": Cortisporin-TC. | |
| Source: compiled by the editor from various references; see credits. | |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day | Expression | Frequency per Day |
tc | 274 | tc works | 20 |
kimlik no tc | 193 | minolta tc 1 | 20 |
kimlik.nvi.gov.tr tc | 117 | tc williams high school | 18 |
kimlik tc | 109 | kimlik.com.tr tc | 18 |
tc credit union | 93 | 99m tc | 15 |
tc electronics | 70 | tc e | 15 |
kimlik.gov.tr tc | 57 | tc contender | 14 |
tc electronic | 50 | kimlik numarasi tc | 13 |
176 iso tc | 38 | 80n3 tc | 13 |
tc spoiler | 35 | computer services tc | 12 |
tc helicon | 33 | e15ed tc | 12 |
dc52 tc | 31 | de promotoras tc | 12 |
chrysler tc | 30 | 1a snt tc | 12 |
tc computer | 30 | eagle record tc | 12 |
kimlik numarası tc | 29 | bbs tc | 12 |
mg tc | 27 | racing tc | 12 |
direct tc | 24 | kimlik no.gov.tr tc | 11 |
talent tc | 22 | american tc | 11 |
tc 2000 | 21 | palm tc | 11 |
tc uncovered | 21 | airandhotel.com login.asp tc | 11 |
| Source: compiled by the editor from various references; see credits. | |||
| Language | Translations for "Tc"; alternative meanings/domain in parentheses. | |
Danish | transmission convergence sublag (TC sublayer, transmission convergence sublayer), tekniskt klassificeret gummi (TC-rubber, technically classified rubber), TC-gummi (TC-rubber, technically classified rubber), TC sublag (TC sublayer, transmission convergence sublayer). (various references) | |
Dutch | transmission convergence sublayer (TC sublayer, transmission convergence sublayer), technisch geclassificeerde rubber (TC-rubber, technically classified rubber), TC-codering op afstand (remote TC coding), TC11 (receipt, TC 11, TC11), TC 11 (receipt, TC 11, TC11), T.C.-rubber (TC-rubber, technically classified rubber), ontvangstbewijs (receipt, TC 11, TC11). (various references) | |
Finnish | TC-alikerros (TC sublayer, transmission convergence sublayer), siirtokanavan kaukokoodaus (remote TC coding). (various references) | |
French | TC11 (TC 11, TC11), TC 11 (TC 11, TC11), sous-couche TC (TC sublayer), sous-couche de convergence de transmission (TC sublayer), récépissé (TC 11, TC11), codage au CT éloigné (remote TC coding), caoutchouc sous spécification (TC-rubber). (various references) | |
German | Transmission-Convergence-Sublayer (TC sublayer, transmission convergence sublayer), technisch klassifizierter Kautschuk (TC-rubber, technically classified rubber), TC-Sublayer (TC sublayer, transmission convergence sublayer), Fern-TC-Codierung (remote TC coding). (various references) | |
Greek | υποστρώμα TC (TC sublayer, transmission convergence sublayer), υποστρώμα σύγκλισης μετάδοσης (TC sublayer, transmission convergence sublayer), ελαστικό τεχνικά ταξινομημένο (TC-rubber, technically classified rubber). (various references) | |
Hungarian | pont parancsnok (team commander), csoportparancsnok (team commander), örs parancsnok (team commander). (various references) | |
Italian | TC11 (receipt, TC 11, TC11), TC 11 (receipt, TC 11, TC11), ricevuta (acknowledgement, acquittance, quittance, receipt), codifica alla centrale di transito remota (remote TC coding). (various references) | |
Pig Latin | tcay.(various references) | |
Portuguese | subcamada TC (TC sublayer, transmission convergence sublayer), subcamada de convergência de transmissão (TC sublayer, transmission convergence sublayer), codificação na central de trânsito distante (remote TC coding), borracha sob especificação (TC-rubber, technically classified rubber). (various references) | |
Spanish | subcapa de convergencia de transmisión (TC sublayer, transmission convergence sublayer), codificación en el CT distante (remote TC coding), caucho TC (TC-rubber, technically classified rubber), caucho técnicamente clasificado (TC-rubber, technically classified rubber). (various references) | |
Swedish | tekniskt klassificerat gummi (TC-rubber, technically classified rubber), TC-gummi (TC-rubber, technically classified rubber). (various references) | |
| Source: compiled by the editor from various translation references. | ||
Derivations | |
Words beginning with "Tc": tchotchke, tchotchkes. (additional references) | |
Words containing "Tc": abbotcies, abbotcy, aitch, aitchbone, aitchbones, aitches, apparatchik, apparatchiki, apparatchiks, backstitch, backstitched, backstitches, backstitching, backstretch, backstretches, bankruptcies, bankruptcy, baronetcies, baronetcy, batch, batched, batcher, batchers, batches, batching, bewitch, bewitched, bewitcheries, bewitchery, bewitches, bewitching, bewitchingly, bewitchment, bewitchments, birdwatcher, birdwatchers, birrotch, bitch, bitched, bitcheries, bitchery, bitches, bitchier, bitchiest, bitchily, bitchiness, bitchinesses, bitching, bitchy, blotch, blotched. (additional references) | |
| Source: compiled by the editor, based on several corpora (additional references). | |
Scrabble® Enable2K-Verified Anagrams | |
| Words containing the letters "c-t" | |
+1 letter: act, cat, cot, cut, tic. | |
+2 letters: acta, acts, cant, cart, cast, cate, cats, celt, cent, cete, chat, chit, cist, cite, city, clit, clot, coat, coft, colt, coot, cost, cote, cots, cult, curt, cute, cuts, cyst, duct, etch, etic, fact, itch, otic, pact, scat, scot, scut, sect, tace, tach, tack, taco, tact, talc, tick, tics, torc, tuck. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
| 1. Definition 2. Synonyms 3. Crosswords 4. Usage: Modern | 5. Usage: Commercial 6. Images: Photo Album 7. Images: Digital Art 8. Quotations: Non-fiction | 9. Usage Frequency 10. Names: Company Usage 11. Expressions 12. Expressions: Internet | 13. Translations: Modern 14. Abbreviations 15. Acronyms 16. Derivations | 17. Anagrams 18. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
