The atom loses a proton. The atom attracts additional electrons. The atom increases in atomic mass. The atom becomes negatively charged.
I gave my students this multiple choice question: What happens when an atom gains an electron?

Only one answer is correct among these 4 choices:
- The atom loses a proton.
- The atom attracts additional electrons.
- The atom increases in atomic mass.
- The atom becomes negatively charged.

Could you tell me which one is correct?

The atom becomes negatively charged.