## Q. 3.4

What is the chemical symbol of the element that fits each of the following descriptions based on periodic table location?

a. Located in both Period 3 and Group IVA
b. The Period 4 noble gas
c. The Period 2 alkaline earth metal
d. The Period 3 halogen

## Verified Solution

a. Period 3 is the third row of elements and Group IVA is the fifth column from the right side of the periodic table. The element that has this column–row (period–group) location is Si (silicon).
b. The noble gases are the elements of Group VIIIA (the right-most column in the periodic table). The Period 4 (fourth row) noble gas is Kr (krypton).
c. The alkaline earth metals are the elements of Group IIA (the second column from the left side of the periodic table). The Period 2 (second row) alkaline earth metal is Be (beryllium).
d. The halogens are the elements of Group VIIA (the second column from the right side of the periodic table). The Period 3 (third row) halogen is Cl (chlorine).