technetium

technetium
technetium
Symbol: Tc
Atomic number: 43
Atomic weight: (98)
Radioactive metallic transition element. Can be detected in some stars and the fission products of uranium. First made by Perrier and Segre by bombarding molybdenum with deutrons, giving them Tc-97. Tc-99 is the most stable isotope with a half-life of 2.6*10^6 years. Sixteen isotopes are known. Organic technetium compounds are used in bone imaging. Chemical properties are intermediate between rhenium and manganese.

Elements of periodic system. 2013.

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Look at other dictionaries:

  • Technetium — Technétium Technétium Molyb …   Wikipédia en Français

  • Technétium — Molybdène ← Technétium → Ruthénium Mn …   Wikipédia en Français

  • Technetium-99 — (99Tc) is an isotope of technetium which decays with a half life of 211,000 years, emitting soft beta rays but no gamma rays, and has a fission product yield of 6.0507% for thermal neutron fission of uranium 235. It is the most significant long… …   Wikipedia

  • TECHNÉTIUM — Du grec tekhnétos , artificiel. Symbole chimique: Tc Numéro atomique: 43 Masse atomique: 98,9 g Point de fusion: 2 172 0C Point d’ébullition: 4 877 0C Densité (à 20 0C): 11,5 Métal du groupe du manganèse produit artificiellement pour la première… …   Encyclopédie Universelle

  • technetium — [tek nē′shē əm, tek nē′shəm] n. [ModL < Gr technētos, artificial (< technasthai, to contrive by art < technē: see TECHNIC) + IUM: so named (1947) by E. G. Segré (1905 89), It American physicist, and C. Perrier, It physicist, who… …   English World dictionary

  • Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re …   Wikipedia

  • Technetium — Eigenschaften …   Deutsch Wikipedia

  • technetium — /tek nee shee euhm, sheuhm/, n. Chem. an element of the manganese family, not found in nature, but obtained in the fission of uranium or by the bombardment of molybdenum. Symbol: Tc; at. wt.: 99; at. no.: 43; sp. gr.: 11.5. [1945 50; < Gk… …   Universalium

  • Technétium 99 — Le technétium 99, noté 99Tc, est l isotope du technétium dont le nombre de masse est égal à 99 : son noyau atomique compte 43 protons et 56 neutrons avec un spin 9/2+ pour une masse atomique de 98,9062547 g/mol. Il est caractérisé par… …   Wikipédia en Français

  • Technetium — Tc (Symbol) * * * Tech|ne|ti|um 〈n.; s; unz.; chem. 〉 künstlich hergestelltes, radioaktives chemisches Element, Ordnungszahl 43 [<grch. technetos „künstlich“] * * * Tech|ne|ti|um [griech. techne̅tós = künstlich gemacht (téchne̅ = Kunst,… …   Universal-Lexikon

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