[tek-nee-shee-uh
m, -shuhm] 
| Chemistry. 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; atomic weight: 99; atomic number: 43; specific gravity: 11.5. |
| tech·ne·ti·um (těk-nē'shē-əm, -shəm) n. Symbol Tc A silvery-gray radioactive metal, the first synthetically produced element, having 14 isotopes with masses ranging from 92 to 105 and half-lives up to 4.2 × 106 years. It is used as a tracer and to eliminate corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7. See Table at element. [From Greek tekhnētos, artificial, from tekhnāsthai, to make by art, from tekhnē, art; see technical.] |
technetium tech·ne·ti·um (těk-nē'shē-əm, -shəm)
n.
Symbol Tc
A radioactive metal, the first synthetically produced element, used as a tracer and to inhibit corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7.
