Which group of metals is generally more reactive?

Group 1 metals, also known as alkali metals, are generally more reactive compared to other groups of metals. This increased reactivity can be attributed to their atomic structure. Alkali metals have one electron in their outermost shell, which makes them eager to lose that electron to achieve a stable electronic configuration, similar to that of noble gases.

As you move down the group, the reactivity of alkali metals increases because the outer electron is further from the nucleus. This results in a weaker attraction to the positively charged nucleus and makes it easier for the atom to lose that outer electron. Consequently, alkali metals react vigorously with water and halogens, and their reactions typically release a significant amount of energy.

In contrast, transition metals have varying reactivities, and while they can be reactive, they do not exceed the reactivity of alkali metals. Group 2 metals, also known as alkaline earth metals, are less reactive than Group 1 metals. Noble gases are not reactive under normal conditions due to having a complete outer electron shell, making them stable and unreactive. Therefore, Group 1 metals hold the highest reactivity among the groups mentioned.