Technetium

2 definitions found

From WordNet (r) 2.0 [wn]:

  technetium
       n : a crystalline metallic element not found in nature; occurs
           as one of the fission products of uranium [syn: {Tc}, {atomic
           number 43}]

From Elements database 20001107 [elements]:



  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.