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McMillan and Abelson published their results in a paper entitled Radioactive Element 93 in the Physical Review on May 27, 1940. [67] They did not propose a name for the element in the paper, but they soon decided on the name neptunium since Neptune is the next planet beyond Uranus in our solar system, which uranium is named after.
The element 93, ausenium, was named after a Greek name of Italy, Ausonia. [3] The element 94, hesperium, was named in Italian Esperio after Hesperia, a poetic name of Italy. [1] Fascist authorities wanted one of the elements to be named littorio after the Roman lictores who carried the fasces, a symbol appropriated by Fascism. [1]
McMillan suspected that the other was an isotope of a new, undiscovered element, with an atomic number of 93. [11] At the time it was believed that element 93 would have similar chemistry to rhenium, so he began working with Emilio Segrè, an expert on that element from his discovery of its homolog technetium. Both scientists began their work ...
In December 1940, his team working at the 60-inch cyclotron at the Lawrence Radiation Laboratory at the University of California at Berkeley produced man-made plutonium (element 93). They created ...
Based on the periodic table of the time, Fermi believed that element 93 was ekarhenium—the element below rhenium—with characteristics similar to manganese and rhenium. Such an element was found, and Fermi tentatively concluded that his experiments had created new elements with 93 and 94 protons, [47] which he dubbed ausenium and hesperium.
Neptunium (93 Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Like all trace or artificial elements, it has no stable isotopes.
A minor actinide is an actinide, other than uranium or plutonium, found in spent nuclear fuel.The minor actinides include neptunium (element 93), americium (element 95), curium (element 96), berkelium (element 97), californium (element 98), einsteinium (element 99), and fermium (element 100). [2]
This produced neptunium, element 93, which underwent beta-decay to form a new element, plutonium, with 94 protons. [4] Kennedy built a series of detectors and counters to verify the presence of plutonium.