Internal Structures of Electron, Neutron, Proton and Nuclei – Particle Masses Are not Arbitrary

The mass of neutron is slightly greater than1838 electrons. So it is argued that neutron contains 919 electron-positron pairs and that a positron is slightly heavier than electron. It can be shown that the minimum number of electron- positron pairs required to create a spherical structure with minimum imperfection is 919, thus validating the argument. A similar logic is applied to arrive at the structure of electron/positron. Based on these, it is argued that the natural choice of elementary particles is deterministic, and not random.