Which of the following describes neutrons?

Neutrons are subatomic particles that possess a significant physical mass, comparable to that of protons, but they do not have an electrical charge. This neutrality is a key characteristic that differentiates neutrons from protons and electrons, the other primary subatomic particles. Neutrons typically reside in the nucleus of an atom alongside protons, contributing to the atomic mass and stability of the nucleus.

The description of neutrons being "ultra high energy" can refer to certain contexts in nuclear or particle physics, particularly when discussing scenarios involving high-energy collisions or reactions. However, the fundamental property that defines a neutron is its mass and lack of charge, which is accurately captured in the correct answer.

Other descriptions do not accurately represent neutrons. Particles without mass is incorrect, as neutrons are indeed massive. Ultra low energy particles mistakenly suggest that neutrons have negligible energy, which is not the case; they have significant energy contributions in nuclear processes. Finally, particles that travel at the speed of light inaccurately misrepresent neutrons, as they are massive particles that do not travel at the speed of light, a speed that only massless particles like photons can achieve. This understanding is essential in grasping the nature of atomic structure and the forces