* Bromine (Br)
* Iodine (I)
These elements, along with chlorine, all belong to Group 17 of the periodic table, also known as the halogens. This means they share similar chemical properties, including:
* High electronegativity: They readily gain electrons to form negative ions.
* Diatomic molecules: They exist as diatomic molecules (Cl₂, Br₂, I₂) in their elemental state.
* Reactive nonmetals: They are very reactive, particularly with metals, forming salts.
* Similar reactivity trends: Their reactivity decreases down the group, with chlorine being the most reactive.
However, there are also some differences in their properties. For instance, bromine is a liquid at room temperature, while iodine is a solid.
