Answer:
Add or remove a proton
Explanation:
This is because if you add a neutron, Oxygen becomes an isotope. If you add or remove a valence electron, it becomes a positive or negatively charged ion. If you add or remove a proton, you take away its chemical identity. If you add a proton, Oxygen becomes Fluorine, take away a proton, it becomes Nitrogen
Answer:
Add or remove a proton
Explanation:
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