Metals are typically considered pure elements, not mixtures. However, you might be thinking about alloys. Alloys are mixtures of metals, or metals and other elements.

Here are 3 common alloys:

1. Brass: A mixture of copper and zinc.

2. Bronze: A mixture of copper and tin.

3. Steel: A mixture of iron and carbon (with other elements often added).

Let me know if you'd like to know more about alloys!