* Belongs to Group 2 of the periodic table: This group is also known as the alkaline earth metals.

* Has two valence electrons: This means it has two electrons in its outermost shell, making it highly reactive and willing to lose these electrons to form a +2 cation.

* Reacts with water to form alkaline hydroxides: Calcium reacts with water to form calcium hydroxide (Ca(OH)2), which is an alkaline solution (meaning it has a pH greater than 7).

In summary: Calcium exhibits all the characteristics of an alkaline earth metal, including its group placement, reactivity, and tendency to form alkaline solutions.