Four atoms of it per monomer occur in Teflon, and along with chlorine, it is found in Freon.
Free radical substitution of hydrocarbons using this element is uncontrollably exothermic and can cleave carbon-carbon bonds. This element is the most common one in magic acid. Oxygen has a positive oxidation state only when bonded to this element. This element is the strongest contributor to the inductive effect and was the first one known to form noble gas compounds when it was discovered that four atoms of it bind to xenon. Four atoms of it per monomer occur in Teflon, and along with chlorine, it is found in Freon. The binary acid of this element can etch glass and dissolve bone. For 10 points, name this lightest halogen, the most electronegative element.
Free radical substitution of hydrocarbons using this element is uncontrollably exothermic and can cleave carbon-carbon bonds.
fluorine [or F]