Assertion: neptunium | /r/HasProperty | artificial
Facets:
value: entirely
type: DEGREE
value: usually
type: TEMPORAL
Source sentences:
text: Neptunium was considered to be entirely artificial when it was first discovered.
text: Neptunium is an artificial chemical element.
text: Originally, scientists thought that neptunium was a purely artificial element.
text: Neptunium ( 93 Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given.
text: Neptunium was considered to be entirely artificial when it was first discovered.
text: Neptunium is an artificial chemical element; in the nature infinitesimal amounts of neptunium are possible in uranium ores.