You are given samples of three metals- sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.

Sodium, magnesium and copper can be arranged based on their reactivity with water. Sodium reacts violently in reaction with water. Magnesium does not react with water and copper also do the same.The most reactive is sodium and less reactive is copper.

Sodium>magnesium>copper