Word: seaborg
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Dates: during 1945-1945
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...when University of California scientists produced a new, "synthetic" element (neptunium) by bombarding uranium with neutrons from a cyclotron. Neptunium has 93 electrons, which meant that the list of known elements was growing at the heavy end. It grew some more that same year when Dr. Glenn T. Seaborg and co-workers synthesized plutonium, which has 94 electrons...
Last week Dr. Seaborg, speaking at Chicago, made another momentous announcement. By bombarding uranium and plutonium with high-energy helium ions, he produced two more elements: Nos. 95 and 96. He told little more about them, for like all atomic scientists, Dr. Seaborg still has G-men breathing down his neck. But all elements heavier than uranium are supposedly unstable. Numbers 95 and 96 will certainly be of interest to atomic bombardiers...