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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
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
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
Promethium
…is one of only two radioactive elements that are both preceded and succeeded in the periodic table by elements with stable forms, the other being technetium. Chemically, promethium is a lanthanide. Promethium shows only one stable oxidation state of +3. In 1902 Bohuslav Brauner suggested that there was a…
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