Question

Rutherford's students chadwick atomic theory

Answer 1

Chadwick's Experiment

 In 1932, Chadwick carried out an experiment in which a sample of Beryllium was bombarded with alpha particles, which caused it to emit this mysterious radiation. He assumed it was gamma rays.[2] He then discovered that this radiation, upon striking Paraffin Wax (proton-rich surface), would dislodged some of the protons, coming to the conclusion it was gamma rays. Chadwick, however did not believe that gamma rays could account for the protons from the wax. He was convinced that the beryllium was emitting neutrons.[3]

Chadwick could tell that the mysterious radiation was neutral because it was not deflected by electric or magnetic fields and it did not invoke the photoelectric effect, unlike standard gamma radiation. This was when photons such as gamma rays, strike certain surfaces, they discharge electrons.[4] However it discharged protons, which meant that the particles had to be more massive than previously expected. Therefore also coming to the conclusion that neutrons had a heavier mass than protons. 

Chadwick's Atomic Model 
Neutrons were found to have the same mass as protons which accounted for more of the mass of the atom and allowed the known mass of an atom and the known mass of its particles to match. The common understanding of an atom was now a nucleus containing positively charged protons and neutral neutrons with the rest of the atom being space in which negatively charged electrons, with a mass so small compared to that of the nucleus "orbit" the nucleus on energy levels corresponding to the amount of energy the electrons hold.[5] 

Answer 2

Explanation:

Chadwick graduated from the Victoria University of Manchester in 1911, where he studied under Ernest Rutherford (known as the "father of nuclear physics"). At Manchester, he continued to study under Rutherford until he was awarded his MSc in 1913. ... Chadwick followed his discovery of the neutron by measuring its mass.