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Edwin Mattison McMillan (September 18, 1907 – September 7, 1991) was an American physicist credited with being the first to produce a transuranium element, neptunium.For this, he shared the 1951 Nobel Prize in Chemistry with Glenn Seaborg.
Neptunium is a hard, silvery, ductile, radioactive actinide metal. In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. [8] Neptunium is a hard metal, having a bulk modulus of 118 GPa, comparable to that of manganese. [9]
Joseph William Kennedy (May 30, 1916 – May 5, 1957) was an American chemist who co-discovered plutonium, along with Glenn T. Seaborg, Edwin McMillan, and Arthur Wahl. During World War II , he led the CM (Chemistry and Metallurgy) Division at the Manhattan Project 's Los Alamos Laboratory , where he oversaw research onto the chemistry and ...
University of California, Berkeley, physicist Edwin McMillan led a team that discovered element 93, which he named neptunium in 1940. In November, he was persuaded to leave Berkeley temporarily to assist with urgent research in radar technology. Since Seaborg and his colleagues had perfected McMillan's oxidation-reduction technique for ...
[72] [73] [74] Neptunium-238 was created directly by the bombardment but decayed by beta emission with a half-life of a little over two days, which indicated the formation of element 94. [42] The first bombardment took place on December 14, 1940, and the new element was first identified through oxidation on the night of February 23–24, 1941. [73]
Fermi was born in Rome at Via Gaeta 19. Plaque at Fermi's birthplace. Enrico Fermi was born in Rome, Italy, on 29 September 1901. [3] He was the third child of Alberto Fermi, a division head in the Ministry of Railways, and Ida de Gattis, an elementary school teacher.
Others have created alternative projections over the years that tried to do better justice to the Earth’s geographical scale. In recent years, many have advocated for the Gall-Peters projection, which depicts the size of each continent more accurately — but creates more unfamiliar shapes: Credit: Strebe / Wikimedia Commons
Perey discovered it as a decay product of 227 Ac. [177] Francium was the last element to be discovered in nature, rather than synthesized in the lab, although four of the "synthetic" elements that were discovered later (plutonium, neptunium, astatine, and promethium) were eventually found in trace amounts in nature as well. [178]