Question

13.2 COMPOSITION OF A NUCLEUS 2. What is proton-neutron hypothesis of nuclear nuclear composition composition ? Define the various terms used to describe Proton-neutron hypothesis of nuclear composition. The discovery of neutrons by Chadwick, led Heisenberg to propose proton-neutron hypothesis in 1932. According to this hypothesis, protons and neutrons are the main building blocks of the nuclei of all atoms. According to this hypothesis, a nucleus of mass number A and atomic number Z contains Z protons and (A - Z) neutrons. The protons give positive charge to the nucleus, while protons and neutrons together give it mass. To neutralise, the positive charge of the nucleus, it to make the atom electrically neutral, the number of extra-nuclea electrons is Z - Proton. It is a fundamental particle which may be called the nucleus of hydrogen. It has a positive charg of 1.6 x 10c. It has a rest mass 1.6726x 10-kg, which is about 1836 times the te mass of an electron. A proton has an intrinsic (spe angular momentum equal to 1/2. It also possesses magnetic moment much smaller than that of electron

Answer 1