Which of the following lists of items contains only ions? A) CO₂, H₂O, Na⁺, H^- B) Na^+,H^-, Pb, Hg C) Pb, Hg, CO₂, NaCl D) Cl^-, Na⁺, Ca²⁺, NO3^- E) NaCl, NO, CO, NaOH

Question

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The items in choice D are all ions, as indicated by the presence of a positive or negative charge (represented by the superscripts) attached to each chemical symbol. The other choices contain non-ionic compounds, such as metals or covalently-bonded molecules.

Which of the Following Lists of Items Contains Only Ions