Assertion: metal's density | /r/HasProperty | low
Facets:
Source sentences:
text: The very reactive Group 1 The Alkali Metals have low density (some float on water)
text: Some metals (the alkali and alkaline earth metals) have low density, low hardness, and low melting points.
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).