 Discovery of the neutron

The discovery of the neutron is a significant milestone in the field of nuclear physics. It was made by the British physicist James Chadwick in 1932. Prior to this discovery, atomic structure was understood primarily through the existence of protons and electrons. ### Background - **Atomic Theory**: By the early 20th century, it was known that atoms contained a nucleus made up of protons, which are positively charged, and surrounding electrons, which carry a negative charge.