An element in this group is attached to the alpha carbon of a carboxylic acid in the Hell-Volhard-Zelinsky reaction. In mass spec, two peaks of equal height two units apart characterize a member of this group. (10[1])An atom of a member of this group is displaced in a positive silver nitrate test. (-5[1])Adding magnesium to hydrocarbons containing a member of this group creates Grignard (“grin-yard”) reagents. (-5[1])These elements, which are denoted with an X in organic structures, can replace (10[1])hydrogen (-5[1])since they both require one more electron for a full (10[1])outer shell. For 10 points, name this group of elements with seven valence electrons, including fluorine and chlorine. (10[1])■END■ (10[3])