Final answer:
Neutrons are neutral particles located mainly in the nucleus and have a mass slightly greater than protons. They, along with protons, are nucleons that contribute significantly to an atom's mass.
Step-by-step explanation:
Neutrons are subatomic particles with several key characteristics relevant to the structure of atoms. The following statements best describe neutrons:
- Neutrons are found mainly in the nucleus.
- Neutrons are particles with zero charge.
Neutrons, along with protons, are called nucleons and are tightly packed in the atomic nucleus. They have nearly the same mass as protons but are slightly more massive, with no electric charge. Neutrons contribute significantly to the mass of an atom and, together with protons, define the atomic nucleus's structure.