Assertion: protactinium | /r/AtLocation | uranium ores
Facets:
value: as pitchblende in extremely low concentrations
type: LOCATION
value: to the extent
type: OTHER
value: (approx
type: TEMPORAL
Source sentences:
text: Protactinium is a natural chemical element, found in uranium ores as pitchblende in extremely low concentrations; but protactinium can be obtained artificially by nuclear reactions from 232Th.
text: Protactinium occurs in uranium ore
text: Protactinium exist in extremely low concentrations in uranium ores (approx.
text: It occurs in all uranium ores to the extent of..
text: Protactinium is a natural chemical element, found in uranium ores as pitchblende in extremely low concentrations; but protactinium can be obtained artificially by nuclear reactions from 232Th.