Astatine is a halogen. Column VII(7) on the periodic table. Therefore, the elements that would have similar properties to it are the other halogens: Iodine(I), Bromine(Br), Chlorine(Cl), Fluorine(F) Solution Astatine is a halogen. Column VII(7) on the periodic table. Therefore, the elements that would have similar properties to it are the other halogens: Iodine(I), Bromine(Br), Chlorine(Cl), Fluorine(F).