Cyanuric acid reacts with this element to form troclosene (“TROH-cluh-seen”), which slowly bleeds it into solution. Radicals of this element are considered reactive but not selective because they mainly substitute at primary alkyl hydrogens. Sodium hydroxide is made by electrolysis in an industrial process named (20[1])for this element. This nonmetal is the first element to have a stable plus-seven oxidation state even though its Pauling electronegativity is the same as oxygen, (*) 3.5 (“three point five”). This element has the highest electron affinity on the periodic table. This element is the oxidizing atom in bleach, and its radicals initiate the chain reaction that degrades ozone. For 10 points, name this element found with fluorine and carbon in freon, a halogen used to sterilize swimming pools. ■END■