Technetium

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Term Paper Title	Technetium
# of Words	419
# of Pages (250 words per page double spaced)	1.68

Technetium

Technetium

Nalin Balan
NUCL 200
Paper due 02/07/97

       Atomic Number: 43
       Atomic Symbol: Tc
       Atomic Weight: (97)
       Electron Configuration: -18-13-2

History, Properties and Uses:

     (Gr. technetos, artificial) Element 43 was predicted on the basis of the
periodi c table, and was erroneously reported as having been discovered in 1925,
at which time it was named masurium. The element was actually discovered by
Perrier and Segre in Italy in 1937. It was found in a sample of molybdenum,
which was bombarded by deut erons in the Berkeley cyclotron, and which E.
Lawrence sent to these investigators.
       Technetium was the first element to be produced artificially. Since its
discovery, searches for the element in terrestrial material have been made
without s uccess. If it does exist, the concentration must be very small.
Technetium has been found in the spectrum of S-, M-, and N-type stars, and its
resence in stellar matter is leading to new theories of the production of heavy
elements in the stars. Nineteen isotopes of technetium, with atomic masses
ranging from 90 to 108, are known. 97Tc has a half-life of 2.6 x 10^6 years.
98Tc has a half-life of 4.2 x 10^6 years. The isomeric isotope 95mTc, with a
half-life of 61 days, is useful for tracer work, as it p...

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