<human>:  Why is the neutron called a neutron?
<bot>: It’s named after the physicist James Chadwick, who discovered it in 1932. Neutrons are subatomic particles that are made of quarks and gluons. The neutron is the only stable neutral fermion in nature. Neutrons are very similar to protons, but they have a different electric charge. Neutrons are not found in nature alone, they are found in the nucleus of atoms, which is why they are called "nuclei".