1) Atomic number 43 2) Chemical element 3) Element discovered in 1937 4) Element number 43 5) Element with the symbol Tc 6) Metal 7) Metallic element 8) Radioactive metal; symbol Tc 9) Synthetic element
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1) Tc
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Technetium is the chemical element with atomic number 43 and the symbol Tc. It is the first element in the periodic table without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically, and only minute amounts are found in nature. Naturally occurring technetium occurs as a spontaneous fission product ...
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chemical element, synthetic radioactive metal of Group VIIb of the periodic table, the first element to be artificially produced. The isotope ... [4 related articles]
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<radiology> Tc-99m, half-life: 6.03 hr, decay: isomeric transition, radiation: gamma, 140 keV (98%) ... (12 Dec 1998) ...
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(Tc) (tek-ne´she-әm) a chemical element, atomic number 43, atomic weight 99. technetium 99m the most frequently used radioisotope in nuclear medicine, a gamma emitter having a half-life of 6.01 hours.
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Technetium is an artificial element with the symbol Tc.
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[
n] - a crystalline metallic element not found in nature
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A radioactive element not found in ores. Symbol Tc
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Tc noun a crystalline metallic element not found in nature; occurs as one of the fission products of uranium
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Silver-grey, radioactive, metallic element, atomic number 43, relative atomic mass 98.906. It occurs in nature only in extremely minute amounts, produced as a fission product from uranium in pitchblende and other uranium ores. Its longest-lived isotope, Tc-99, has a half-life of 216,000 years. It is a superconductor and is used as a...
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