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