Three hydrogen atoms are replaced by three atoms of this element in an acetic acid derivative to increase its Ka (“K-a”) by 34,000 times. A uranium compound with six atoms of this element (10[1])is a byproduct (10[1])of enrichment. A polymer in which each carbon (-5[1])is bonded to two atoms of this element (10[1])is used to coat stir bars and non-stick pans. This element and hydrogen (-5[1])form a binary acid that can etch glass. Carbon, chlorine, (10[1])and this element name a class of volatile compounds that includes refrigerants like Freon. This element has a value close to 4 on the Pauling scale, (10[1])as it is the most electronegative (10[1])element. For 10 points, name this lightest halogen (10[1])commonly added to toothpaste. ■END■ (10[2])