Assertion: metal's density | /r/HasProperty | nb
Facets:
Source sentences:
text: Some metals appear coloured (Cu, Cs, Au), have low densities (e.g. Be, Al) or very high melting points (e.g. W, Nb), are liquids at or near room temperature (e.g. Hg, Ga), are brittle (e.g. Os, Bi), not easily machined (e.g. Ti, Re), or are noble (hard to oxidise, e.g. Au, Pt) or have nonmetallic structures (Mn and Ga are structurally analogous to, respectively, white P and I).