It has a negative charge. It moves around the nucleus. It adds mass to the nucleus. It has a positive charge.
I gave my students this multiple choice question: Which statement best describes a neutron?

Only one answer is correct among these 4 choices:
- It has a negative charge.
- It moves around the nucleus.
- It adds mass to the nucleus.
- It has a positive charge.

Could you tell me which one is correct?

It adds mass to the nucleus.