A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom?

Protons have a charge of +1 each, while electrons have a charge of −1 each; neutrons have no charge. The three protons contribute +3 and the three electrons contribute −3, so the charges cancel to 0. The atom’s overall charge is 0, choice B.

AI-written and checked against the verified answer.