Question

what happens when an atom gains an electron? a. it has an increase in the number of protons. b. it becomes a negative ion. c. it has an increase in the number of neutrons. d. it becomes a positive ion.

Explanation:

An atom is neutral with equal number of protons and electrons. When it gains an electron, it has more electrons than protons, resulting in a negative - charge. This negatively - charged particle is called a negative ion. Protons and neutrons are not affected by an atom gaining an electron.

Answer:

B. It becomes a negative ion.