Describe how metals can be arranged in order of reactivity.

Metals can be arranged in order of reactivity based on their ability to displace other metals from compounds and react with water or acids. The reactivity series ranks metals from most reactive, such as potassium and sodium, to least reactive, like gold and platinum. This arrangement helps predict how metals will behave in chemical reactions. For example, a more reactive metal will displace a less reactive metal from its compound, demonstrating its higher reactivity. Understanding this order is crucial for applications in extraction and metal usage.