Assertion: bronze's copper | /r/HasProperty | pure chemical element
Facets:
value: with the atomic number
type: OTHER
Source sentences:
text: Copper is a pure chemical element and a natural mineral that can be found mainly in the earth
text: Copper is a pure elemental metal with the atomic number 29, while both bronze and brass are alloys of copper and other metals.
text: However, the key difference between copper and bronze is, Copper is a pure chemical element as well as a natural mineral whereas bronze is a metal alloy.