Yes, neptunium is an artificial chemical element.
Neptunium is an individual element; isotopes of neptunium are not separated.
No, neptunium is not a naturally occurring element. It is a synthetic element that was first produced in a laboratory setting in 1940.
Neptunium was discovered in 1940.
Neptunium is a ductile metal.
Neptunium is an artificial element; it is not mined.
Neptunium is a chemical element.
neptunium has 93 protons.
Any element; neptunium can form himself a critical mass.
Neptunium is an artificial chemical element but neptunium can be found also in the nature as a result of decay processes in uranium ores, only in ultratraces.
Yes, neptunium is a metallic element and can exhibit a metallic luster when polished.
Neptunium is an artificial chemical element; in the nature infinitesimal amounts of neptunium are possible in uranium ores.
Neptunium itself is an element, the simplest form of matter.