(tek nE' she em) the
first synthesized element got its name from the
Greek word for "artificial"
atomic mass 98.0 amu
3,915.0º F (2,157.0º C)
boiling point 7,709.0º F
Technetium is a silvery-gray metal that
tarnishes slowly in moist air.
Elemental technectium does not
naturally occur on Earth, but its spectral lines
have been observed in S-, M-, and N-type stars.
technetium-99 is produced from the waste products
of uranium nuclear fuel.
Tc-99 is used for radiactive
tracing in medicine, and for equipment
Small amounts of
technetium can retard the corrosion of steel,
although this protection can only be applied to
closed systems due to technetium's radioactivity.
Element 43 was predicted by Dmitri Mendeleev,
creator of the periodic table, who called the
"missing element" eka-manganese. It was
first reported as having been discovered in
Berlin, Germany, by Ida Tacke, Walter Noddack,
and Otto Berg in 1925, at which time it was named
masurium after the region in Prussia where
Noddack was born. That discovery was disputed,
however. It was conclusively isolated
in 1937 by Carlo Perrier and Emilio
Segrè at the University of
Palermo in Sicily, who created elemental
technetium by bombaring molybdenum atoms with
deutrons that had been accelerated by a
cyclotron. In 1962, technetium-99 was
isolated and identified in African pitchblende (a
uranium rich ore) in extremely minute quantities
as a spontaneous fission product of uranium-238
by B.T. Kenna and P.K. Kuroda
Los Alamos National Laboratory http://periodic.lanl.gov/43.shtml
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