Final answer:
The only polyatomic ion from the list provided that has a positive charge is the ammonium ion (NH4+).
Step-by-step explanation:
The student asked which of the following polyatomic ions has a positive charge: A) hydrogen carbonate B) nitrate C) hydroxide D) cyanide E) ammonium. To answer this question, we'll define a polyatomic ion as a group of atoms that are covalently bonded and carry an overall electrical charge. The only polyatomic ion listed that has a positive charge is E) ammonium (NH4+).