Which are more reactive metals?

The metals found at the top of the reactivity series are highly reactive. As you go down the series, their reactivity decreases. Examples for reactive metals are potassium, sodium, aluminium. Reactive metals lose electrons in the outermost shell and have large capacity to form cations. For example, reactive metals react vigorously with dilute acids to give hydrogen gas. Highly reactive metals burn by reacting with oxygen from air at room temperature. They can only be extracted by electrolytic reduction.