Assertion: hafnium | /r/HasProperty | refractory
Facets:
Source sentences:
text: Hafnium is refractory; melting point, 2222° ± 30° C; boiling point, 5400° C. Atomic heat capacity, 26.3 kilojoules per kg-atom · °K (kJ/kg-atom · ° K), or 6.27 cal/(g-atom · deg) (25°-100° C); electrical resistance, 32.4 × 10−8 ohm · m (0° C).
text: Lu and Hf are also refractory elements, meaning they quickly condensed from the protoplanetary disk to form the solid part of Earth, as opposed to volatile elements.
text: Hafnium and tungsten are both refractory elements