Suchergebnisse
Suchergebnisse:
Vor einem Tag · Plutonium (specifically, plutonium-238) was first produced, isolated and then chemically identified between December 1940 and February 1941 by Glenn T. Seaborg, Edwin McMillan, Emilio Segrè, Joseph W. Kennedy, and Arthur Wahl by deuteron bombardment of uranium in the 60-inch (150 cm) cyclotron at the Berkeley Radiation Laboratory at ...
- silvery white, tarnishing to dark gray in air
- see Allotropes of plutonium
- [244]
Vor 3 Tagen · It is named after the American nuclear chemist Glenn T. Seaborg. As a synthetic element, it can be created in a laboratory but is not found in nature. It is also radioactive; the most stable known isotope, 269 Sg, has a half-life of approximately 14 minutes. In the periodic table of the elements, it is a d-block transactinide element.
- 106
- group 6
- [269]
Vor 4 Tagen · Glenn T. Seaborg, der Mitentdecker zahlreicher Transuran-Elemente und damalige Präsident der United States Atomic Energy Commission, schrieb 1966 im Vorwort der amerikanischen Ausgabe von Hahns wissenschaftlicher Autobiographie: „Mitte der 30er Jahre sowie in Verbindung mit unserer Arbeit mit Plutonium einige Jahre später ...
Vor 4 Tagen · The Journals of Professor Glenn T. Seaborg, 1939-1946 Edited and annotated by Ronald L. Kathren, Jerry B. Gough, Gary T. Benefiel.
Vor 2 Tagen · An eight-period table containing this block was suggested by Glenn T. Seaborg in 1969. The first element of the g-block may have atomic number 121, and thus would have the systematic name unbiunium. Despite many searches, no elements in this region have been synthesized or discovered in nature.
Vor 4 Tagen · “I met Nobel Laureate Dr. Glenn T. Seaborg, who worked with (former) Morehouse President Dr. Walter E. Massey on the Manhattan Project,” said Walker. “I’m a second-generation student of Nobel Laureate William N. Lipscomb. My thesis advisor in grad school, Dr. John H. Hall, Jr., was a student of Lipscomb. The work that Hall and his ...
Vor 4 Tagen · On the late Friday afternoon of July 15, 1960, Senator John F. Kennedy of Massachusetts appeared before a crowd of eighty thousand people in the Los Angeles Memorial Coliseum to deliver his formal acceptance of the Democratic party’s nomination for President of the United States. Before what was at the time touted as the largest crowd ever to hear a political speech, John F. Kennedy spoke of ...
