Assertion: neptunium | /r/AtLocation | three allotropes
Facets:
Source sentences:
text: Neptunium exists in three allotropes: it has an orthorhombic structure at normal temperatures, a tetragonal structure above 280oC and a cubic structure above 577oC. (2)
text: Neptunium is silvery in appearance, chemically reactive, and is found in three allotropes:Neptunium has the largest liquid range of any element, 3,363°C, between the melting point and boiling point.
text: Neptunium is found in at least three allotropes.