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technetium    
n. 锝

□

technetium
n 1: a crystalline metallic element not found in nature; occurs
as one of the fission products of uranium [synonym:
{technetium}, {Tc}, {atomic number 43}]

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.


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