Assertion: actinium | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
value: in natural occurrence
type: OTHER
Source sentences:
text: Part of this scarcity is because actinium is remarkably rare.
text: Actinium is a rare earth metal.
text: Actinium is a rare element that is present in uranium ores in tiny amounts, but it is usually cheaper and easier to create actinium when it is needed by bombarding radium with neutrons in a nuclear reactor.
text: Part of this scarcity is because actinium is remarkably rare.
text: Actinium is very rare and expensive; it has not common uses.
text: But actinium is rare, expensive and radioactive; perhaps I consider that actinium is good for science.
text: 1. a radioactive element of the actinide series; found in uranium ores Familiarity information: ACTINIUM used as a noun is very rare.
text: Actinium is very rare and expensive; it has not common uses.
text: Part of this scarcity is because actinium is remarkably rare.
text: Actinium is very rare and expensive; it has not common uses.
text: Actinium like most of the other Lanthanoid elements, is extremely rare in natural occurrence.
text: Yes, but because actinium is very rare and strongly radioactive his chemistry was studied only a little.
text: Actinium is extremely rare, found in all uranium ores.
text: Part of this scarcity is because actinium is remarkably rare.
text: Actinium is a rare earth metal that is found in small quantities in uranium ore.