Final answer:
The symbol for the element in Group 2A (2) and Period 4 is Ca, which stands for calcium, an alkaline earth metal.
Step-by-step explanation:
The chemical element described as being in Group 2A (2) and Period 4 on the periodic table is the alkaline earth metal calcium with the symbol Ca.
Group 2A, also known as Group 2, consists of the alkaline earth metals which are known for having two valence electrons.
Since the element is specified to be in Period 4, we can determine its identity by moving down to the fourth row of the periodic table and locating the second column which corresponds to Group 2.
Thus, the symbol for the element in Group 2A (2) and Period 4 is Ca.