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Technetium
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Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium is one of only two radioactive elements both preceded
Technetium-99 electroplated onto a strip of gold foil
Technetium-99 electroplated onto a strip of gold foil
Periodisches System der Elemente (Periodic system of the elements) (1904–1945, now at the Gdańsk University of Technology): lack of elements: polonium
Periodisches System der Elemente (Periodic system of the elements) (1904–1945, now at the Gdańsk University of Technology): lack of elements: polonium 84Po (though discovered as early as in 1898 by Maria Sklodowska-Curie), astatine 85At (1940, in Berkeley), francium 87Fr (1939, in France), neptunium 93Np (1940, in Berkeley) and other actinides and lanthanides. Uses old symbols for: argon 18Ar (here: A), technetium 43Tc (Ma, masurium), xenon 54Xe (X),
Chloro-containing coordination complexes of technetium (99Tc) in various oxidation states: Tc(III), Tc(IV), Tc(V), and Tc(VI) represented.
Chloro-containing coordination complexes of technetium (99Tc) in various oxidation states: Tc(III), Tc(IV), Tc(V), and Tc(VI) represented.
The first technetium-99m generator, unshielded, 1958. A Tc-99m pertechnetate solution is being eluted from Mo-99 molybdate bound to a chromatographic
The first technetium-99m generator, unshielded, 1958. A Tc-99m pertechnetate solution is being eluted from Mo-99 molybdate bound to a chromatographic substrate
Promethium
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Promethium is a generally synthetic chemical element; it has symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurrin
Technetium
…Technetium is one of only two radioactive elements both preceded and succeeded in the periodic table by elements with stable forms, the other being promethium. All available technetium is produced as a synthetic element. Naturally occurring technetium is a spontaneous fission product in uranium ore and thorium…
Promethium 147 solution
Promethium 147 solution
Promethium nitrate
Promethium nitrate
Uraninite, a uranium ore and the host for most of Earth's promethium
Uraninite, a uranium ore and the host for most of Earth's promethium