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. (-5[1])An atom (10[1])of a member of this group is displaced in a positive silver nitrate test. (10[1])Adding magnesium to hydrocarbons containing a member of this group (10[1])creates Grignard (“grin-yard”) reagents. (10[1])These elements, which are denoted with an X in organic (10[1])structures, (10[2])can replace hydrogen since they both require one more (10[1])electron (-5[1])for a full outer shell. (10[1])For 10 points, name this group of elements (10[1])with seven valence electrons, (10[1])including fluorine and chlorine. ■END■ (10[1])