Which is more reactive group 1 or 2?

Group 1 elements, also known as alkali metals, are generally more reactive than group 2 elements, known as alkaline earth metals. This is because alkali metals have one electron in their outermost shell, making them more willing to lose that electron to achieve a stable electron configuration. Alkaline earth metals have two electrons in their outermost shell, requiring more energy to lose those electrons and become stable.