a silver-gray, metallic chemical element obtained by the irradiation of molybdenum with deuterons and in the fission of uranium: it does not exist in nature and all its isotopes are radioactive: it is a superconductor, an inhibitor of metal corrosion, and a medical tracer: symbol, Tc; at. no. 43
Origin of technetiumModern Latin ; from Classical Greek techn?tos, artificial (; from technasthai, to contrive by art ; from techn?: see technic) + -ium: so named (1947) by E. G. Segré (1905-89), It-American physicist, and C. Perrier (1886-1948), Italian physicist, who discovered it (1937)
A silvery-gray radioactive metal, the first synthetically produced element, having isotopes with masses ranging from 85 to 118 and half-lives up to 4.2 million years. It is principally used as a tracer in a variety of medical applications. It is a remarkable inhibitor of corrosion in steel, but this use is limited because of radioactivity hazards. Atomic number 43; melting point 2,157°C; boiling point 4,265°C; specific gravity 11.50 (calculated); valence 0, 2, 4, 5, 6, 7. See Periodic Table.
Origin of technetiumFrom Greek tekhn&emacron;tos, artificial, from tekhnasthai, to make by art, from tekhn&emacron;, art; see technical.
- A metallic chemical element (symbol Tc) with an atomic number of 43.
techno- +"Ž -ium because it was the first artificially created element.