Which statement about the elements in the periodic table is true

The reactivity of alkali metals increases as atomic mass increases.

Explanation:

There are six elements in the periodic table that can be classified as alkali metals. These elements are extremely reactive and it is correct to say that the reactivity of alkali metals increases as the atomic mass increases.

These metals can be found in the IA family of the periodic table and contain the names: Lithium, Sodium, Potassium, Rubidium, Cesium, Francium.

it is stable as it is in group 0 which have full outer shells of electrons