Assertion: hafnium | /r/HasProperty | element
Facets:
value: on the periodic table
type: LOCATION
Source sentences:
text: Hafnium is an element that was predicted by Mendeleev (of periodic table fame) before it was actually discovered.
text: Hafnium is an element that chemists knew existed, but could not find.
text: The thinking finally emerged that Hafnium was an element needing somewhat parallel treatment with other rather unremarkable elements, but the nucleus and its excitation of one of its isotopes (mass 178) gave the element a notability that needed to be remarked, but the explication could be made in adequate detail only in a separate page at Induced gamma emission(IGE).
text: Hafnium is an element not a rock.
text: Hafnium is an element not a rock.
text: Hafnium is an element not a rock.
text: Hafnium is an element that chemists knew existed, but could not find.
text: Obtaining pure zirconium is very difficult because it is chemically similar to hafnium, an element which is always found mixed with deposits of zirconium.
text: Hafnium is element 72 on the periodic table.
text: Hafnium, element 72, was discovered by Danish physicist Dirk Coster and and Hungarian physicist Georg von Hevesy in 1922.