This halogen has an electronegativity of 4.0, making it the (*) most electronegative element.
Along with sodium and aluminum, this element makes up the uncommon mineral cryolite. This element bound to carbon can be used to create Teflon. Freon was a brand name given to another combination of this element with carbon and chlorine, which is considered a key agent in ozone layer depletion. This halogen has an electronegativity of 4.0, making it the (*) most electronegative element. For 10 points, name this element whose anion is used in a process that makes public water healthier for teeth.
Along with sodium and aluminum, this element makes up the uncommon mineral cryolite.
fluorine