Calcium must lose two electrons to get a full outer shell. what is the name of the group to which calcium belongs

The answer to this question would be: alkaline earth metal

Alkali earth metal is the second column group of the periodic table. In this group, the element has 2 extra electrons in their outer cells. That is why most of this metal has 2 + charge.

Their neighbor is the alkali metal which was the first column of the periodic table. The name is similar so don't confused and mix them each other.