what experiment did james chadwick use?
 In Chadwick's time most of this was still being experimented upon. In the beginning the experiments he did were to prove that if alpha particles (two protons and two neutrons bound together)fell on light elements such as beryllium, boron,and lithium gamma radiation (A type of radioactive decay that has the shortest wavelength but it is the most energetic form of decay)would not be the result. Chadwick's hypothesis was correct, it wasn't gamma radiation but rather a beam of neutrons. Chadwick's experiment included projecting alpha particles toward Beryllium the light element. 