Answer the following question given this paragraph: 

Sometimes atoms lose or gain electrons. Then they become ions . Ions have a positive or negative charge. That’s because they do not have the same number of electrons as protons. If atoms lose electrons, they become positive ions, or cations. If atoms gain electrons, they become negative ions, or anions.


Q: When an atom gains or loses an electron it becames an?

 Choices:

- electron

- photon

- neutron

- ion

A:
ion
