Here's why:

* Particle Arrangement: When particles are far apart and randomly arranged, it indicates a gas.

* Bromine's Properties: Bromine is a diatomic element (Br₂) and is a reddish-brown liquid at room temperature. It readily evaporates into a reddish-brown gas.

In summary: While the description of particles being far apart and random aligns with a gas, bromine's state at room temperature is liquid.