What is a neutron?

Neutron is one of the nucleons that make up the nucleus. Neutron is 1932 B. chadwick discovered it in the experiment of bombarding with particle A, but according to E? Named after Rutherford's suggestion. Neutron is electrically neutral, and its mass is1.649286×10-27 kg (939.56563 MeV), which is slightly larger than that of proton. Neutron is an indispensable component in the chemical elements that make up the nucleus. Although the chemical properties of atoms are determined by the number of protons in the nucleus, without neutrons, it is impossible to form elements other than hydrogen due to the repulsive force between positively charged protons. The number of neutrons and protons in light nuclei is almost equal; In heavy nuclei, the number of neutrons is greater than that of protons. For nuclei with a certain number of protons, the number of neutrons can take several different values within a certain range to form different isotopes of an element.