Infer which statements about O2- are correct. It is an oxygen ionIts overall charge is negativeIt has gained two electronsIt has lost two electrons

The correct statements about O2- are:

1. It is an oxygen ion: This is correct. An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. In this case, O2- is an ion of oxygen.

2. Its overall charge is negative: This is correct. The 2- indicates that the ion has a net charge of -2.

3. It has gained two electrons: This is correct. The negative charge indicates that electrons, which carry a negative charge, have been added. In this case, two electrons have been added to the oxygen atom to form the O2- ion.

4. It has lost two electrons: This is incorrect. If the oxygen atom had lost two electrons, it would have a 2+ charge, not a 2- charge. The negative charge indicates that electrons have been gained, not lost.