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technetium [Tc]
From the Greek technetos meaning artificial. Discovered in 1937 by Carolo Perrier & Emilio Segre The 1st artificially-produced element.
Occurrence:
1) obtained by bombarding molybdenum with deutrons or neutrons & in the fission of uranium
2) found in the spectrum of S-, M & N-type stars
3) all Tc on earth is artificially produced
Characteristics:
1) silver-gray metal
2) radioactive
3) tarnishes slowly in moist air
4) Tc-99 emits gamma radiation
Uses:
1) Tc-99 is used medical imaging
a) with sestamibi in myocardial perfusion studies
b) bone scans
2) calibraton of particle detectors
Related
periodic table
scintigraphy (radionuclide test)
Specific
technetium 99m ([99m]Tc)
General
radioactive element
metal
Properties
SIZE: AW = 98.906
atomic number
VALUE: 43
VALENCE: KR 4D5 5S2
Database Correlations
PUBCHEM cid=23957
References
- Webster's Ninth New Collegiate Dictionary, Miriam-
Webster Inc. Springfield, MA 1990
- Chemical & Engineering News, Sept 8, 2003