Neptunium

neptunium

The planet Neptune, which neptunium is named after

Neptunium is a chemical element that has the symbol Np on the periodic table. It has the atomic number 93 which means it has 93 protons and electrons in its atoms. It is named after the planet Neptune in the same way as Uranium is named after the planet Uranus.

Neptunium was discovered in the year of 1940 by two men named Edwin McMillan and Phillip H. Abelson at Berkeley Radiation Center of the University of California.

Neptunium is a silvery-metallic element and is radioactive. Its melting point is 637 degrees Celsius and its boiling point is 4000 degrees Celsius. Its atomic mass is 237.

Neptunium Media

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  Phase diagram of neptunium

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  The 4n + 1 decay chain of neptunium-237, commonly called the "neptunium series"

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  Dmitri Mendeleev's table of 1871, with an empty space at the position after uranium.

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  The 60-inch cyclotron at the Lawrence Radiation Laboratory, University of California, Berkeley, in August 1939

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  Flowchart, showing the Purex process and the likely oxidation state of neptunium in the process solution.

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  Neptunium ions in solution

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  Ball-and-stick model of the neptunocene molecule, Np(C8H8)2], as found in the solid state.*X-ray crystallographic data from D. J. A. De Ridder, J. Rebizant, C. Apostolidis, B. Kanellakopulos and E. Dornberger (March 1996). "Bis(cyclooctatetraenyl)neptunium(IV)". Acta Cryst. C52 (3): 597-600. DOI:10.11