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Period 4 element
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===Bromine=== [[File:Bromine 25ml.jpg|frameless|left|upright=0.3]] [[Bromine]] (Br) is an element in [[halogen|group 17 (halogen)]]. It does not exist in elemental form in nature. Bromine is barely liquid at room temperature, boiling at about 330 kelvins. Bromine is also quite toxic and corrosive, but bromide ions, which are relatively inert, can be found in [[halite]], or table salt. Bromine is often used as a [[fire retardant]] because many compounds can be made to release free bromine atoms.
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