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Technetium
Technetium
Periodisches System der Elemente (1904–1945, now at the Gdańsk University of Technology): lack of elements: 84 polonium Po (though discovered as early
Periodisches System der Elemente (1904–1945, now at the Gdańsk University of Technology): lack of elements: 84 polonium Po (though discovered as early as in 1898 by Maria Sklodowska-Curie), 85 astatine At (1940, in Berkeley), 87 francium Fr (1939, in France), 93 neptunium Np (1940, in Berkeley) and other actinides and lanthanides. Old symbols for: 18 argon Ar (here: A), 43 technetium Tc (Ma, masurium), 54 xenon Xe (X), 86 radon, Rn (Em, emanation)
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
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Estimated distribution of dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled "atoms" is com
Estimated distribution of dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled "atoms" is composed of chemical elements.
Portrait of Robert Boyle, c. 1740
Portrait of Robert Boyle, c. 1740
Title page of The Sceptical Chymist, published in 1661
Title page of The Sceptical Chymist, published in 1661
Portrait of Isaac Watts by John Shury, c. 1830
Portrait of Isaac Watts by John Shury, c. 1830