apr 17, 1932 - James Chadwick-Discovery of Neutrons
Description:
1932-Using alpha particles, James discovered that neutral atomic particle had a mass close to a proton and a charge of 0. Thus the neutron was discovered. The experiment was when he shot alpha rays onto a sheet of beryllium (filtered out electrons) .Added to timeline:
Date:
apr 17, 1932
Now
~ 93 years ago