- Types:
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At, astatine, atomic number 85
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
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Br, atomic number 35, bromine
a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
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Cl, atomic number 17, chlorine
a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)
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F, atomic number 9, fluorine
a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite
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I, atomic number 53, iodin, iodine
a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
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radiochlorine
a radioactive isotope of chlorine
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iodine-131
heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter
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iodine-125
light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism
