Which characteristic is true for alkaline earth metals?

Alkaline earth metals are located in group 2 of the periodic table. One of their defining characteristics is their reactivity, particularly with water. When alkaline earth metals, such as magnesium and calcium, react with water, they typically produce hydrogen gas and a corresponding hydroxide. This reaction is often vigorous, especially with heavier alkaline earth metals, highlighting their tendency to form basic solutions.

These metals are also known to react with other substances, including acids and halogens, readily participating in various chemical reactions. The increase in reactivity as you move down the group reflects their relatively low ionization energies compared to other metals, making it easier for them to lose their outer electrons and form positive ions.

Recognizing the properties of alkaline earth metals can clarify why other characteristics, such as being found in a different group or being very unreactive, do not apply to them. Their ability to easily react with water is a significant characteristic that sets them apart from many other metal groups, aligning perfectly with the right choice.