Answer: D. Silver is a pure metallic element from the periodic table — every atom is silver. Brass is an alloy of copper and zinc — a mixture of two metals dissolved into each other while still solid.
A is wrong: brass conducts electricity well (metals and alloys both have free electrons).
B is wrong: brass is metallic, not a non-metal.
C is wrong twice: silver is a metal (not non-metal), and brass is a mixture (not a compound). Alloys do not have a fixed composition.
D states both facts correctly: silver = pure element, brass = mixture.
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