technetium
Sign in to saveTechnetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium and promethium are the only radioactive elements whose neighbours in the sense of atomic number are both stable. All available technetium is produced as a synthetic element. Naturally occurring technetium is a spontaneous fission product in uranium ore and thorium ore (the most common source), or the product of neutron capture in molybdenum ores. This silvery gray, crystalline transition metal lies between manganese and rhenium in group 7 of th
AI overview
Technetium is a radioactive chemical element (symbol Tc) that is the lightest element where all forms are radioactive, and it must be created synthetically since it doesn't exist naturally in significant amounts. It matters because it is used in medical imaging and industrial applications, and understanding it helps scientists study radioactive elements and nuclear processes.
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Article
29 sectionsContents
- History
- Early assumptions
- Early misidentifications
- Irreproducible results
- Official discovery and later history
- Characteristics
- Physical properties
- Chemical properties
- Compounds
- Pertechnetate and other derivatives
- Other chalcogenide derivatives
- Simple hydride and halide complexes
- Coordination and organometallic complexes
- Isotopes
- Occurrence and production
- Fission product
- Fission product for commercial use
- Waste disposal
- Neutron activation
- Particle accelerators
- Applications
- Nuclear medicine and biology
- Industrial and chemical
- Precautions and biological effect
- Notes
- References
- Bibliography
- Further reading
- External links
Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium and promethium are the only radioactive elements whose neighbours in the sense of atomic number are both stable. All available technetium is produced as a synthetic element. Naturally occurring technetium is a spontaneous fission product in uranium ore and thorium ore (the most common source), or the product of neutron capture in molybdenum ores. This silvery gray, crystalline transition metal lies between manganese and rhenium in group 7 of the periodic table, and its chemical properties are intermediate between those of both adjacent elements. The most common naturally occurring isotope is 99Tc, in traces only.
Many of technetium's properties had been predicted by Dmitri Mendeleev before it was discovered; Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937, technetium became the first predominantly artificial element to be produced, hence its name (from the Greek '''', 'artificial', +