Step 1: Define an alloy and an element.
An element is a pure substance consisting of only one type of atom (e.g., Copper, Zinc, Gold). An alloy is a mixture of two or more elements, where at least one is a metal.
Step 2: Classify the given options.
Copper, Zinc, and Gold are all pure metallic elements found on the periodic table. Brass is not an element; it is a well-known alloy made by combining Copper and Zinc.