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Pu
Plutonium


Atomic no.:
94
Atom. weight: 244.0642
Density: 19.74
Class:
Actinide
Melting point: 641°C
Boiling point: 3327°C
Colour: silvery shiny
   
Discoverer: Glenn T. Seaborg, J. W. Kennedy, E. M. McMillan, Dr. Michael Cefola and A. C. Wahl
Place: USA
Year: 1941

Plutonium is a rare radioactive, metallic and toxic chemical element. It has the symbol Pu and the atomic number 94. It is a fissile element used in most modern nuclear weapons. The most significant isotope of plutonium is 239Pu, with a half-life of 24,100 years. It can be made from natural uranium. The most stable isotope is 244Pu, with a half-life of about 80 million years, long enough to be found in extremely small quantities in nature, making 244Pu the nucleon-richest atom that naturally occurs in the Earth's crust, albeit in small traces. The production of plutonium and neptunium by bombarding uranium-238 with neutrons was predicted in 1940 by two teams working independently: Edwin M. McMillan and Philip Abelson at Berkeley Radiation Laboratory at the University of California, Berkeley; and by Egon Bretscher and Norman Feather at the Cavendish Laboratory of the University of Cambridge for the Tube Alloys project. Coincidentally both teams proposed the same names to follow on from uranium, following the sequence of the outer planets. Plutonium was first produced and isolated on December 14, 1940 by Dr. Glenn T. Seaborg, Edwin M. McMillan, J. W. Kennedy, and A. C. Wahl by deuteron bombardment of uranium in the 60-inch cyclotron at Berkeley. The discovery was kept secret due to the war. It was named after Pluto, having been discovered directly after neptunium (which itself was one higher on the periodic table than uranium), by analogy to solar system planet order as Pluto was considered to be a planet at the time (though technically it should have been "plutium", Seaborg said that he did not think it sounded as good as "plutonium"). Seaborg chose the letters "Pu" as a joke, which passed without notice into the periodic table. Originally, Seaborg and others thought about naming the element "ultinium" or "extremium" because they believed at the time that they had found the last possible element on the periodic table

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smart-elements - Acrylic Element cube - Plutonium - 50mm

Acrylic Element cube - Plutonium - 50mm

Amount: 1 St.
Purity :-------


1 pcs.: 39.00 € - tax free

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