Assertion: neptunium | /r/HasProperty | created
Facets:
value: by reacting neptunium metal
type: OTHER
value: synthetically
type: MANNER
Source sentences:
text: Although scientists used to think neptunium could only be created synthetically, trace amounts of four of neptunium's 25 isotopes have since been found in nature, according to Los Alamos National Laboratory.
text: Np 3 P 4 can be created by reacting neptunium metal with red phosphorus at 740 °C in a vacuum and then allowing any extra phosphorus to sublimate away.
text: Neptunium is present in extremely small quantitles in Uranium ores and is created when a neutron that is emitted by one uranium atom undergoing fission is captured in the nucleus of another uranium atom.
text: Neptunium is present in extremely small quantitles in Uranium ores and is created when a neutron that is emitted by one uranium atom undergoing fission is captured in the nucleus of another uranium atom.