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. The O2- ion is indeed an oxygen ion. An ion is an atom or molecule that has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge.

2. Its overall charge is negative: This is correct. The O2- ion has a net charge of -2. This is because it has gained two electrons, and each electron carries a negative charge.

3. It has gained two electrons: This is correct. The O2- ion has gained two electrons. This is what gives it its negative charge. Oxygen normally has 8 electrons, but the O2- ion has 10.

4. It has lost two electrons: This is incorrect. The O2- ion has not lost electrons, it has gained them. If it had lost two electrons, it would have a positive charge, not a negative one.