Assertion: protactinium | /r/HasProperty | one of the rarest elements
Facets:
value: extremely
type: DEGREE
value: with the symbol
type: OTHER
Source sentences:
text: Protactinium is one of the rarest elements on Earth.
text: Because protactinium is a rare element, it is not used for commercial purposes and only for scientific research.
text: Protactinium is a rare metal that reacts with inorganic acids, water vapor, and oxygen.
text: Protactinium is a rare earth metal; it naturally occurs in Zaire.
text: Protactinium is a rare actinide element with the symbol Pa.
text: Protactinium is one of these rare elements with few applications, which came very close to being named the most boring element in a recent paper in Nature.
text: Protactinium is rare and expensive mineral and due to its high radioactivity and toxicity it is not used much but for scientific research.
text: Protactinium is a very rare metallic chemical element which is classified among the actinides on the periodic table of elements.
text: Protactinium is one of the rarest elements and is found in minute quantities in uranium minerals and ores, and can be extracted from these sources in gram quantities.
text: Protactinium is one of the rarest elements on Earth.
text: Protactinium is one of the rarest elements on Earth.
text: Found naturally only in trace quantities and seminal to alternate nuclear reactor fuels, protactinium is an extremely rare element that could reveal new trends among nearby actinide elements, including uranium.
text: Found naturally only in trace quantities and seminal to alternate nuclear reactor fuels, protactinium is an extremely rare element that could reveal new trends among nearby actinide elements, including uranium.