Neptunium is a solid, dense metal; the fresh surface has a silvery appearance.
Neptunium is a solid metal with a metallic appearance.
Neptunium is ductile and malleable; see also at: http://www.onemine.org/search/summary.cfm/Institute-of-Metals-Division--Fabrication-of-Neptunium237-Wire-by-Extrusion-TN?d=25FB0091D9A4A9A7F667E4C439E0ED9006727D6BC0570438EA2470D65AC3E9C126367
None occur naturally since neptunium (Np) is not known to occur naturally. Common, reasonably stable, salts of Np include the nitrate, sulfate and chloride (sonitrogen, sulfur and chlorine). Neptunium can also be synthesized as the dioxide and the hydroxide (NpO2, NpOH)
Neptunium trifluoride is an intermediate for the preparation of neptunium metal.
Neptunium is a metal.
The three common compounds of neptunium are neptunium dioxide (NpO2), neptunium trichloride (NpCl3), and neptunium tetrafluoride (NpF4).
Neptunium is an individual element; isotopes of neptunium are not separated.
Neptunium can chemically combine with a variety of substances, including oxygen, nitrogen, halogens (such as chlorine), and various other elements. It can form compounds like neptunium dioxide (NpO2), neptunium tetroxide (NpO4), and neptunium nitride (NpN). The specific compounds formed depend on the conditions and elements present during the reaction.
Neptunium(IV) oxide or neptunium dioxide is the chemical compound composed of neptunium and oxygen with the formula NpO2. It forms dark olive[4] green cubic crystals[1].
Electron configuration of neptunium: [Rn]7s26d15f4
No use today; neptunium trifluoride is used to prepare neptunium metal.
Neptunium is an artificial element.Amounts of natural neptunium are absolutely nonsignificant.