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Name the non-metal that is liquid in room temperature.

Answer: Bromine is a non-metallic element that is liquid at ambient temperature and a third halogen

It has an atomic number of 35 and a mass of 79.904 grammes.

Bromine is a liquid because intermolecular interactions are strong enough to prevent it from vaporising. Br creates diatomic molecules with sufficient van der Waals force.