Chlorine, bromine and iodine resemble one another in that they

Chlorine, bromine, and iodine resemble one another in that they displace one another from solutions of their salts. This is due to the fact that they are all halogens and have similar chemical properties. Halogens are highly reactive non-metals that have seven electrons in their outermost energy level. Because they all have a similar electronic configuration, they react similarly with other elements and compounds. In the case of displacing one another from solutions of their salts, this is because they are all capable of oxidizing and reducing one another. As a result, if a more reactive halogen is added to a solution containing a less reactive halogen, the more reactive halogen will displace the less reactive halogen from its salt. This displacement reaction is a common property of halogens and is used in various chemical applications.