Credit: NILERED/SCIENCE PHOTO LIBRARY

Caption: Bromine evaporating. Time-lapse footage of a sample of liquid bromine (Br2) evaporating from a watch glass. Bromine liquid is weakly bonded. It has a very high vapour pressure, and evaporates rapidly at atmospheric pressure. The sample shown here evaporated in around four minutes. The element bromine is part of the halogen group, and is the only non-metallic element that is a liquid at room temperature. It is extremely toxic and takes its name from a Greek word meaning stench. Bromine compounds are used in water purification and textile flameproofing.

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