Assertion: plutonium | /r/HasProperty | unique
Facets:
value: in exhibiting six different crystallographic phases
type: OTHER
Source sentences:
text: Plutonium is unique among the elements in its physicochemical complexities by virtue of its position at a transitional location in the periodic table where the 5f electrons are at the border between delocalized (not associated with a single atom) and localized (associated with a single atom) behavior
text: Plutonium is a unique element in exhibiting six different crystallographic phases at ambient pressure (it has a seventh phase under pressure).