Question

what does exist in neutrons?

Answer 1

Answer:

Neutrons exist in the nuclei of atoms, along with their positively charged counterparts, the protons. Neutrons and protons, commonly called nucleons, are bound together in the atomic nucleus, where they account for 99.9 percent of the atom's mass.

Answer 2

Answer:

The neutron is a subatomic particle in the atom no net electric charge and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons.