Bromine, when it is a liquid, is represented by the same chemical formula as when it is a gas or a solid: Br₂.

The subscript "2" indicates that bromine exists as a diatomic molecule, meaning two bromine atoms are bonded together.

It's important to note that the physical state of bromine (liquid, solid, or gas) is often indicated with parentheses after the formula, like this:

* Br₂(l) - liquid bromine

* Br₂(s) - solid bromine

* Br₂(g) - gaseous bromine