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halogen summary

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Below is the article summary. For the full article, see halogen.
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dioxin Summary
Dioxin, any of a group of aromatic hydrocarbon compounds known to be environmental pollutants that are generated as undesirable by-products in the manufacture of herbicides, disinfectants, and other agents. In popular terminology, dioxin has become a synonym for one specific dioxin,
astatine
astatine Summary
Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table. Astatine, which has no stable isotopes, was first synthetically produced (1940) at the University of California by American physicists Dale R. Corson, Kenneth R.
bromine
bromine Summary
Bromine (Br), chemical element, a deep red noxious liquid, and a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. atomic number 35 atomic weight [79.901, 79.907] melting point −7.2 °C (19 °F) boiling point 59 °C (138 °F) specific gravity 3.12 at 20 °C (68 °F)
chlorine
chlorine Summary
Chlorine (Cl), chemical element, the second lightest member of the halogen elements, or Group 17 (Group VIIa) of the periodic table. Chlorine is a toxic, corrosive, greenish yellow gas that is irritating to the eyes and to the respiratory system. atomic number 17 atomic weight 35.446 to 35.457