ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Halogens. Three halogen elements, from left to right: chlorine (Cl2), bromine (Br2) and iodine (I2). These are toxic and reactive non-metals. Chlorine is a gas at room temperature. It was used as a chemical weapon during World War One. Bromine is a dark liquid at room temperature, although it readily produces a brown vapour. Iodine is a crystalline solid.
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