Crossword clues for technetium
Douglas Harper's Etymology Dictionary
1947, coined in Modern Latin from Greek tekhnetos "artificial," from tekhne "art, skill, craft" (see techno-) + metallic element ending -ium.
Wiktionary
n. A metallic chemical element (''symbol'' Tc) with an atomic number of 43.
WordNet
n. a crystalline metallic element not found in nature; occurs as one of the fission products of uranium [syn: Tc, atomic number 43]
Wikipedia
Technetium is a chemical element with symbol Tc and atomic number 43. It is the lightest element of which all isotopes are radioactive; none are stable. Only one other such element, promethium, is followed (in the periodic table) by elements with stable isotopes. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth's crust. Naturally occurring technetium is a spontaneous fission product in uranium ore or the product of neutron capture in molybdenum ores. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese.
Many of technetium's properties were predicted by Dmitri Mendeleev before the element was discovered. Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek , meaning "artificial", + -ium).
Its short-lived gamma ray-emitting nuclear isomer— technetium-99m—is used in nuclear medicine for a wide variety of diagnostic tests. Technetium-99 is used as a gamma-ray-free source of beta particles. Long-lived technetium isotopes produced commercially are by-products of fission of uranium-235 in nuclear reactors and are extracted from nuclear fuel rods. Because no isotope of technetium has a half-life longer than 4.2 million years ( technetium-98), the 1952 detection of technetium in red giants, which are billions of years old, helped to prove that stars can produce heavier elements.
Usage examples of "technetium".
Four of the neighbors are also colorful additives in glazes and dyes, suggesting a variety of uses for that rarest of birds, technetium, if only people could be gotten interested in it.
Everyone knows, of course, that soon thereafter, technetium coins were in fact minted and sold by a private company called the Palwal Mint and Trust, which can in no way be connected to Rakesh Solanki, Abha Solanki, or the Kakodar Nuclear Power Station.
Abha, short of funds as always, have monkeyed with her precious reactor to produce an excess of technetium for her hubby to dispose?
Would the Rombili ship technetium to a gook world, considering the shortage of the past year?
At the present reduced levels of use, existing stocks of technetium will last less than eleven deks.
To be able to observe the entry of both rockets into the atmosphere, sodium and technetium had been added to their hypergolic fuel: the first colored the exhaust flame a bright yellow, the second tagged it with a spectral line not found in the spectra of the local sun or the Quintan orbiters.
It would give Iryala added leverage, because no one could make steel without getting their technetium from us.
Kettle was where technite was found, the source of the technetium used in steel manufacture throughout the Confederation.
The refined technite was shipped off-planet for extraction of its technetium, as the extraction process required considerable support technology.
While here, the knowledge of steel without technetium would have been encysted, walled off as a singularity, an unimportance not allowed to influence Standard Technology.
Steel made without technetium would have been described falsely as very inferior, not fit for civilized use.
It is surprising to find such an unstable element as technetium, an explosion product of the atomic bomb, in the stars.
Wilson and Palomar Observatories, found several technetium lines in the spectra of S-type stars.
Or consider the element technetium, whose most stable form has 99 protons and neutrons.
As a result, any technetium formed by stars with the other elements billions of years ago must all be gone by now.