Which of the following anions has its number of oxygen atoms equal to 2 and a net charge of -1?

Name: Which of the following anions has its number of oxygen atoms equal to 2 and a net charge of -1?
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The chlorite ion (ClO2-) has two oxygen atoms and a net charge of -1. Permanganate (MnO4-) has four oxygen atoms and a -1 charge, bicarbonate (HCO3-) has three oxygen atoms and a -1 charge, and nitrate (NO3-) has three oxygen atoms and a -1 charge.

Which of the Following Anions Has Its Number of Oxygen