Here's why:

* All three are halogens: This means they are in the same group (column) on the periodic table. Elements in the same group tend to have similar chemical properties.

* Similar electronegativity: Halogens have high electronegativity, meaning they readily attract electrons. Bromine falls between chlorine and iodine in this regard.

* Similar reactivity: All three halogens are reactive nonmetals, forming diatomic molecules (Br2, Cl2, I2) and readily participating in ionic and covalent bonding.

While bromine is closer in properties to chlorine than iodine due to its position on the periodic table, all three are closely related and exhibit similar chemical behavior.