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bromine (Br)

Bromine. Credit: RTC, Wikipedia
A heavy, volatile, corrosive, reddish-brown, nonmetallic liquid element (see nonmetal), having a pungent and highly irritating vapor. Bromine is one of the halogens, and has properties intermediate between those of chlorine and iodine. It occurs as bromides, mainly in seawater, from which it is extracted by oxidation with chlorine.

Soluble metal bromides (see halides) are used as sedatives; silver bromide, being light-sensitive, is used in photography. Ethylene dibromide, the chief bromine product, is used as a lead scavenger in antiknock additives. Alkyl bromides (see alkyl halides are used as fumigants and solvents.

atomic number 35
relative atomic mass 79.904
electron configuration 1s22s22p63s23p64s23d104p5
first ionization energy 1,140 kJ/mol
electronegativity 3.0
atomic radius 114 pm
melting point -7.2°C (19.0°F)
boiling point 58.78°C (137.8°F)
relative density 3.119

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