Which of the following pairs share similar chemical properties?

Select one:

a. oxygen (O) and Chlorine (Cl)

b. Helium (He) and Hydrogen (H)

c. Fluorine (F) and Neon (Ne)

d. Bromine (Br) and Iodine (I)

I am pretty sure that the pair is a or c

The periodic table is organized into columns (up and down) which share similar properties ... periodicity.

If you look at the periodic table, you'll see that bromine and iodine appear in the same periodic column ... they share similar chemical properties. Therefore, the answer is D.