Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Solution The charges, as well as the atoms, must balance in reactions. The silver atom is being oxidized from the 0 oxidation state to the 1+ state. Whenever something loses electrons, something must also gain electrons (be reduced) to balance the equation. Oxygen is a good oxidizing agent for these reactions because it can gain electrons to go from the 0 oxidation state to the 2 state. Answer: gain electrons
A:
When something loses electrons, it must also?