Question

¿qué pasa cuando un átomo gana un electrón? the atom loses a proton. the atom attracts additional electrons. the atom increases in atomic mass. the atom becomes negatively charged.

Explanation:

An atom is neutral with equal number of protons and electrons. When it gains an electron, it has more electrons (negatively - charged particles) than protons, so it becomes negatively charged.

Answer:

The atom becomes negatively charged.