An alloy of copper with a small amount of tin (or sometimes arsenic), which is harder and more durable than copper alone, is:

Question

Quizplus · Accepted Answer

The alloy described in the question is bronze, which is made by mixing copper with a small amount of tin or sometimes arsenic. Bronze is harder and more durable than copper alone, making it a useful material for tools, weapons, and decorative objects. Steel is an alloy of iron and carbon, not copper and tin/arsenic. Copper and gold are elements, not alloys.

An Alloy of Copper with a Small Amount of Tin