About Bromine
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Bromine is one of the only two elements to be found as a liquid at room temperature. Bromine is a reddish-brown liquid that is very toxic. Bromine has an atomic mass number of 80 and an average atomic mass of 79.904. Bromine's density at room is 3.1g/cm³. Bromine melts at -7.2°C and boils at 58.8°C.
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Bromine is a nonmetal with 35 protons and 45 neutrons. Some common isotopes of Bromine are Br-79 and Br-81 with 44 and 46 neutrons respectively. Bromine does have radioactive isotopes which are Br 70-94.
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Bromine is part of the Halogen Group, which means it has 7 valence electrons. Because Bromine has 7 valence electrons, it is very reactive. Some chemical properties of Bromine is that it would not burn under typical fire conditions and also that Bromine tends to form ionic bonds rather than covalent bonds.