1. Sodium (Na)
2. Copper (Cu)
3. Gold (Au)
Sodium is the most reactive metal among the three. It readily loses its outermost electron and forms a positive ion (Na+). This makes it highly reactive with other substances, such as water, oxygen, and acids.
Copper is less reactive than sodium. It does not react with water at room temperature, but it does react with oxygen to form a layer of copper oxide on its surface. This layer protects the copper from further corrosion.
Gold is the least reactive of the three metals. It is highly resistant to corrosion and does not react with most substances, even at high temperatures. This makes it a valuable metal for jewelry and other decorative purposes.
