Br is a halogen, which is a group of elements in the periodic table that share similar properties. Halogens are known for their reactivity and their ability to form salts with metals. The halogens are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

Ar is a noble gas, which is a group of elements in the periodic table that are known for their lack of reactivity. Noble gases are the least reactive elements on the periodic table. The noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Therefore, Ar does not have properties similar to Br because Ar is a noble gas while Br is a halogen.