National League for Nursing (NLN) Science Practice Exam

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Which part of an atom carries no electrical charge?

Proton.
Electron.
Neutron.
Quark.

The correct answer is: Neutron.

The part of an atom that carries no electrical charge is the neutron. Neutrons are one of the three primary subatomic particles that make up an atom, along with protons and electrons. Protons have a positive charge, while electrons have a negative charge. Neutrons, however, are neutral and do not carry any electrical charge, which allows them to play a crucial role in the stability of atomic nuclei. They help to hold the positively charged protons together, counteracting the repulsive forces between them due to their like charges. Protons, being positively charged, contribute to the overall positive charge of the nucleus, and electrons, with their negative charge, orbit the nucleus, balancing the positive charge. Quarks, which make up protons and neutrons, also carry fractional charges but are not directly a part of the atom in the sense of it being electrically neutral. Understanding the role of neutrons is essential in studying atomic structure, nuclear stability, and the forces that hold atoms together.