Why isn't copper alone used to make bells?

Copper alone isn't used to make bells primarily because it is too soft and malleable, which can affect the bell's tonal quality and durability. Instead, bells are typically made from a bronze alloy, which is a mixture of copper and tin, as this combination provides the necessary strength, resonance, and durability. The alloy enhances the bell's ability to produce a clear, rich sound while maintaining structural integrity. Additionally, the specific properties of bronze allow for better casting and finishing, resulting in superior acoustic performance.