93 - Neptunium

Neptunium metal. This sample was prepared using a hydrometallurgical method with a mercury cathode. (4)

Neptunium metal button. (1)

Neptunium oxidation states +3 to +7.
Np (III) is violet (similar to promethium).
Np (IV) is yellowish green.
Np (V) is green-blue.
Np (VI) is rose.

Neptunium oxidation states. (3)

Large, high-quality single crystal ingot of NpCoGa5 compound. (4)

Neptunium oxide. (5)

A nickel plated sphere of neptunium, used in an experiment to determine the critical mass of this element. (2)

Synthetic computer generated (fake) image of buttons of neptunium metal. (6)

Back to elements

1 - http://www-lab.imr.tohoku.ac.jp/~wshiolab/Metal_Prep/Metal_Prep.htm - Metal button process description and image.
2 - http://www.lanl.gov/orgs/pa/newsbulletin/2002/10/21/text01.shtml - Criticality test.
3 - http://www.imr-oarai.jp/en/research/research2-3.html - Oxidation state colors.
4 - http://jolisfukyu.tokai-sc.jaea.go.jp/fukyu/tayu/ACT04E/07/0701.htm - de Hass-van Alphen effect in Np compounds, characterizing the 5f electrons. Compounds prepared from Np metal.
5 - "Matter", Ralph E. Lapp and the editors of LIFE, LIFE Science Library, 1965, p. 148.
6 - http://www.lenntech.com/Periodic-chart-elements/Np-en.htm - Computer generated (fake) metal button image.