Who discovered neutron (a) James Chadwick (b) William Crooks (c) J.J. Thomson (d) Rutherford June 19, 2025 by abhinaysingh525 Who discovered neutron (a) James Chadwick (b) William Crooks (c) J.J. Thomson (d) Rutherford Answer: (a) James Chadwick discovered neutron ( 0n^1 ).