mass of +3. mass of -3. charge of +3. charge of -3.
I gave my students this multiple choice question: If an ion has three more electrons than protons, it has a

Only one answer is correct among these 4 choices:
- mass of +3.
- mass of -3.
- charge of +3.
- charge of -3.

Could you tell me which one is correct?

charge of -3.