Elemental Halogens. 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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