Task: Text Categorization
Input (English): A 2001 J.C. Alvarez study investigated properties of aromatic polyamides containing this class of elements, and they are reacted with carboxylic acids in the Hunsdiecker reaction. The Finkelstein reaction involves the exchange of two atoms of these elements, and the enrichment of uranium via gaseous diffusion is accomplished using a molecule containing the simplest of these elements, whose synthesis won Henri Moissan the 1906 Nobel in Chemistry. Another member of this group is used as a mordant in Gram staining and has an important role in the thyroid gland. For 10 points, identify these highly reactive Group 17 elements that include iodine and fluorine.
Output (English): Science