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Technetium
Beginning of Essay
NUCL 200
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 err .... Middle of Essay
.... 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 produces energetic
gamma rays. Technetium metal has been produced in kilogram quantities. The metal
was first prepared by passing hydrogen gas at 1100C over Tc2S7. It is now
conveniently prepared by the reduction of ammonium pertechnetate with hydrogen.
Techne tium is a silvery-gray metal that tarnishes slowly in moist air. Until
1960, techne tium was available only in small amounts and the price was as high
as $2800/g. It is now commerci ....
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Words: 407 - Pages: 2
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