The neutron was discovered by

The correct answer is Chadwick. 

Neutron was inevitable from Rutherford's experiment that there must be a neutral, sub-atomic particle with a mass closely equal to protons. James Chadwick in 1932 discovered the neutrons.

• Location: Neutrons are located in the nucleus along with the protons.
• Mass: Along with protons, they make up almost all of the mass of the nucleus as well as atoms.
• Charge: Neutrons are electrically neutral.
• Atomic mass: The total number of protons and neutrons is called the mass number or Atomic mass.
• Isotopes: The variation of neutron number in an element determines the isotope of an atom.
• The ratio of the number of protons and neutrons affects the stability of any element.
• Some isotopes are stable, some are unstable (radioactive).