Which of the following non-metals is liquid at room temperature?

Bromine is the non-metal that exists as a liquid at room temperature. Bromine is a deep, reddish-brown liquid that evaporates easily into a toxic, pungent-smelling vapor. It belongs to the Halogen family (Group 17) of the periodic table, situated between Chlorine and Iodine. Like other halogens, it is highly reactive and does not occur freely in nature, but rather as colorless soluble crystalline bromide salts.