Technetium

Tc 99 Tc43element 43Masurium 99m technetium pertechnetateTc(VII)technetium tc 99m sulfur colloidtechnetium-97technetium-99
Technetium is a chemical element with the symbol Tc and atomic number 43.wikipedia
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Technetium-99m

99m TcTc-99m99m
One short-lived gamma ray-emitting nuclear isomer of technetium—technetium-99m—is used in nuclear medicine for a wide variety of diagnostic tests, such as bone cancer diagnoses.
Technetium-99m ( 99m Tc) is a metastable nuclear isomer of technetium-99 (itself an isotope of technetium), symbolized as 99m Tc, that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope.

Thorium

Ththorium-232thoriated
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.
All but two elements up to bismuth (element 83) have an isotope that is practically stable for all purposes ("classically stable"), with the exceptions being technetium and promethium (elements 43 and 61).

Chemical element

elementelementschemical elements
Technetium is a chemical element with the symbol Tc and atomic number 43.
Of the 94 naturally occurring elements, those with atomic numbers 1 through 82 each have at least one stable isotope (except for technetium, element 43 and promethium, element 61, which have no stable isotopes).

Stable nuclide

Observationally Stablestablestable isotope
It is the lightest element whose isotopes are all radioactive; none are stable, excluding the fully ionized state of 97 Tc.
These comprise the first 82 elements from hydrogen to lead, with the two exceptions, technetium (element 43) and promethium (element 61), that do not have any stable nuclides.

Group 7 element

group 77group 7 elements
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 these two adjacent elements.
They are manganese (Mn), technetium (Tc), rhenium (Re), and bohrium (Bh).

Molybdenum

MomolyMolybdenum (Mo)
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. From the 1860s through 1871, early forms of the periodic table proposed by Dmitri Mendeleev contained a gap between molybdenum (element 42) and ruthenium (element 44).
All unstable isotopes of molybdenum decay into isotopes of niobium, technetium, and ruthenium.

Synthetic element

syntheticartificial elementsynthesized
Nearly all technetium is produced as a synthetic element, and only about 18,000 tons can be found at any given time in the Earth's crust.
The first element discovered through synthesis was technetium—its discovery being definitely confirmed in 1937.

Symbol (chemistry)

symbolchemical symbolchemical symbols
Technetium is a chemical element with the symbol Tc and atomic number 43.

Rhenium

ReNipponiumRe 2
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 these two adjacent elements.
Rhenium has the third-highest melting point and highest boiling point of any stable element at 5903 K. Rhenium resembles manganese and technetium chemically and is mainly obtained as a by-product of the extraction and refinement of molybdenum and copper ores.

Ruthenium

RuRu(NH 3 ) 6 3+ ruthenate
From the 1860s through 1871, early forms of the periodic table proposed by Dmitri Mendeleev contained a gap between molybdenum (element 42) and ruthenium (element 44).
(Technetium, the previous element, has an exceptionally low value that is off the trend due to its half-filled [Kr]4d 5 5s 2 configuration, though it is not as far off the trend in the 4d series as manganese in the 3d transition series.) Unlike the lighter congener iron, ruthenium is paramagnetic at room temperature, as iron also is above its Curie point.

Walter Noddack

Noddack, Walter Karl Friedrich
German chemists Walter Noddack, Otto Berg, and Ida Tacke reported the discovery of element 75 and element 43 in 1925, and named element 43 masurium (after Masuria in eastern Prussia, now in Poland, the region where Walter Noddack's family originated).
He, Ida Tacke (who later married Noddack), and Otto Berg reported the discovery of element 43 and element 75 in 1925.

Emilio Segrè

Emilio G. SegrèEmilio Gino SegrèEmilio Segre
The discovery of element 43 was finally confirmed in a 1937 experiment at the University of Palermo in Sicily by Carlo Perrier and Emilio Segrè.
Emilio Gino Segrè (1 February 1905 – 22 April 1989 ) was an Italian-American physicist and Nobel laureate, who discovered the elements technetium and astatine, and the antiproton, a subatomic antiparticle, for which he was awarded the Nobel Prize in Physics in 1959.

Mendeleev's predicted elements

Mendeleev's nomenclature for unnamed and undiscovered elementsekapredicted
Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em).
The four predicted elements lighter than the rare-earth elements, eka-boron (Eb, under boron, B, 5), eka-aluminium (Ea or El, under Al, 13), eka-manganese (Em, under Mn, 25), and eka-silicon (Es, under Si, 14), proved to be good predictors of the properties of scandium (Sc, 21), gallium (Ga, 31), technetium (Tc, 43), and germanium (Ge, 32) respectively, which fill the spot in the periodic table assigned by Mendeleev.

Transition metal

transition metalstransition elementtransition-metal
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 these two adjacent elements.

Isotopes of technetium

technetium-97technetium-98stability of technetium isotopes
In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek τεχνητός, meaning "synthetic or artificial", + -ium).
Technetium ( 43 Tc) is the first of the two elements lighter than bismuth that have no stable isotopes; the other such element is promethium.

Niobium

NbcolumbiumNiobium (Nb)
Below this temperature, technetium has a very high magnetic penetration depth, greater than any other element except niobium.
In addition, it is one of the three elemental Type II superconductors, along with vanadium and technetium.

Nuclear fission product

fission productfission productsfission fragments
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.
After a few years, the radiation is dominated by strontium-90 and caesium-137, whereas in the period between 10,000 and a million years it is technetium-99 that dominates.

Otto Berg (scientist)

Otto Berg
German chemists Walter Noddack, Otto Berg, and Ida Tacke reported the discovery of element 75 and element 43 in 1925, and named element 43 masurium (after Masuria in eastern Prussia, now in Poland, the region where Walter Noddack's family originated).
The same team was also involved in the discovery of technetium.

Technetium hexafluoride

TcF 6 technetium(VI) fluoride
The following binary (containing only two elements) technetium halides are known: TcF 6, TcF 5, TcCl 4, TcBr 4, TcBr 3, α-TcCl 3, β-TcCl 3, TcI 3, α-TcCl 2, and β-TcCl 2.
Technetium hexafluoride or technetium(VI) fluoride (TcF 6 ) is a yellow inorganic compound with a low melting point.

Pertechnetate

[ 99m TcO 4 pertechnatepertechnetate ion
Pertechnetate (tetroxidotechnetate) behaves analogously to perchlorate, both of which are tetrahedral.
It is often used as a convenient water-soluble source of isotopes of the radioactive element technetium (Tc).

Nuclear medicine

nuclear imagingnuclear cardiologyradionuclide imaging
One short-lived gamma ray-emitting nuclear isomer of technetium—technetium-99m—is used in nuclear medicine for a wide variety of diagnostic tests, such as bone cancer diagnoses.
The most commonly used intravenous radionuclides are Technetium-99m (technetium-99m),

Henry Moseley

Henry Gwyn Jeffreys MoseleyHenry G. J. MoseleyH. G. J. Moseley
The wavelength of the X-rays produced is related to the atomic number by a formula derived by Henry Moseley in 1913.
These spaces are now known, respectively, to be the places of the radioactive synthetic elements technetium and promethium, and also the last two quite rare naturally occurring stable elements hafnium (discovered 1923) and rhenium (discovered 1925).

Paul W. Merrill

Paul MerrillPaul Willard Merrill
In 1952, astronomer Paul W. Merrill in California detected the spectral signature of technetium (specifically wavelengths of 403.1 nm, 423.8 nm, 426.2 nm, and 429.7 nm) in light from S-type red giants.
Shortly before he retired, he succeeded in detecting technetium in the variable star R Andromedae and other red variables.

Masataka Ogawa

M. Ogawa
He extracted and isolated a small amount of an apparently unknown substance from the mineral, which he announced as the discovery of element 43, naming the newly discovered element nipponium.

Uraninite

pitchblendeuranium oreuranite
In 1962, technetium-99 was isolated and identified in pitchblende from the Belgian Congo in extremely small quantities (about 0.2 ng/kg); there it originates as a spontaneous fission product of uranium-238.
The extremely rare elements technetium and promethium can be found in uraninite in very small quantities (about 200 pg/kg and 4 fg/kg respectively), produced by the spontaneous fission of uranium-238.