What is the name of the polyatomic ion with the formula NO_2^-?

• A. Nitride
• B. Ammonium
• C. Nitrite
• D. Nitrate

Answer: (C)

Verified step by step guidance

1. Identify the polyatomic ion formula given: \(\mathrm{NO_2^-}\).
2. Recall common nitrogen-oxygen polyatomic ions and their formulas: Nitrate is \(\mathrm{NO_3^-}\), Nitrite is \(\mathrm{NO_2^-}\), Ammonium is \(\mathrm{NH_4^+}\), and Nitride is \(\mathrm{N^{3-}}\).
3. Match the given formula \(\mathrm{NO_2^-}\) to the correct name from the list of common ions.
4. Understand that \(\mathrm{NO_2^-}\) corresponds to the ion called Nitrite.
5. Confirm that Nitrite is the correct name for the polyatomic ion with the formula \(\mathrm{NO_2^-}\).