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Neptunium - Notable characteristics | | Neptunium - Notable characteristics: Encyclopedia II - Neptunium - Notable characteristics | | Silvery in appearance, neptunium metal is fairly chemically reactive and is found in at least three structural modifications:
alpha-neptunium, orthorhombic, density 20.25 Mg/m3,
beta-neptunium (above 280 °C), tetragonal, density (313 °C) 19.36 Mg/m3, and
gamma-neptunium (above 577 °C), cubic, density (600 °C) 18 Mg/m3.
This element has four ionic oxidation states while in solution:
Np+3 (pale purple), analogous to the rare earth ion PmSee also:Neptunium, Neptunium - Notable characteristics, Neptunium - History, Neptunium - Occurrence, Neptunium - Isotopes, Neptunium - Weapons applications | | | Neptunium, Neptunium - History, Neptunium - Isotopes, Neptunium - Notable characteristics, Neptunium - Occurrence, Neptunium - Weapons applications | | |
| | | Neptunium: Encyclopedia II - Neptunium - Notable characteristics
Neptunium - Notable characteristics
Silvery in appearance, neptunium metal is fairly chemically reactive and is found in at least three structural modifications:
- alpha-neptunium, orthorhombic, density 20.25 Mg/m3,
- beta-neptunium (above 280 °C), tetragonal, density (313 °C) 19.36 Mg/m3, and
- gamma-neptunium (above 577 °C), cubic, density (600 °C) 18 Mg/m3.
This element has four ionic oxidation states while in solution:
- Np+3 (pale purple), analogous to the rare earth ion Pm+3,
- Np+4 (yellow green);
- NpO2+ (green blue): and
- NpO2++ (pale pink).
Neptunium forms tri- and tetrahalides such as NpF3, NpF4, NpCl4, NpBr3, NpI3, and oxides of the various compositions such as are found in the uranium-oxygen system, including Np3O8 and NpO2.
Other related archives1940, Berkeley Radiation Laboratory, Br, C, Cl, Edwin McMillan, F, I, Los Alamos National Laboratory, Neptune, Philip Abelson, University of California, University of California, Berkeley, Walter Russell, actinide, actinide series, alpha emission, atomic number, atomic weight, barium, beta emission, critical mass, decay mode, decay products, discovered, electron capture, enriched uranium, half-life, halides, isotope, lithium, meta states, metal, neutron, nuclear reactors, oxidation states, oxides, oxygen, periodic table, plutonium, protactinium, radioactive, radioisotopes, reactive, reduction, synthetic element, transmutation, transuranic element, transuranium element, u, uranium, uranium ores
 Adapted from the Wikipedia article "Notable characteristics", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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