For 10 points, group 17 consists of which elements that include chlorine?
In the Friedel-Crafts reaction, one member of this group bonded to an alkyl group can be used to attach the alkyl group to an aromatic ring. One of these elements was bonded to xenon to form the first noble gas compound. One member of this group is the rarest non-transuranium element. An acid formed by bonding one of these elements to hydrogen can dissolve (*) glass, and is the only such acid of this group that is weak. This group contains the only nonmetal that is liquid at standard temperature, and each of its members contains seven valence electrons, making them extremely reactive. For 10 points, group 17 consists of which elements that include chlorine?
In the Friedel-Crafts reaction, one member of this group bonded to an alkyl group can be used to attach the alkyl group to an aromatic ring.
 halogen (prompt on "group 17" or "group VII")